Princess Elizabeth circa 1929. Photo / Getty Images

Princess Elizabeth walking a corgi in London's Hyde Park, about 1940. Photo / Getty Images

On horseback with her father, King George VI. Photo / Getty Images

The royal family on the balcony at Buckingham Palace after the coronation of King George VI (1895 - 1952). Photo / Getty Images

1945: Princess Elizabeth, standing by an Auxiliary Territorial Service first aid truck wearing an officer's uniform. Photo / Getty Images

13th June 1946: Princess Elizabeth inspecting ATS (Auxiliary Territorial Service) cadets at a passing out parade at Imperial Services College. Photo / Getty Images

13th July 1947: In her first official appearance since the announcement of her engagement to Philip Mountbatten, Princess Elizabeth arrives in the Mall, London. Photo / Getty Images

The royal honeymoon - Princess Elizabeth with her husband, the Duke of Edinburgh, at Broadlands, Romsey, the country home of Viscount Mountbatten.

Princess Elizabeth circa 1929. Photo / Getty Images

Princess Elizabeth walking a corgi in London's Hyde Park, about 1940. Photo / Getty Images

On horseback as a girl. Photo / Getty Images

The royal family on the balcony at Buckingham Palace after the coronation of King George VI (1895 - 1952). Photo / Getty Images

1945: Princess Elizabeth, standing by an Auxiliary Territorial Service first aid truck wearing an officer's uniform. Photo / Getty Images

13th June 1946: Princess Elizabeth inspecting ATS (Auxiliary Territorial Service) cadets at a passing out parade at Imperial Services College. Photo / Getty Images

13th July 1947: In her first official appearance since the announcement of her engagement to Philip Mountbatten, Princess Elizabeth arrives in the Mall, London. Photo / Getty Images

The royal honeymoon - Princess Elizabeth with her husband, the Duke of Edinburgh, at Broadlands, Romsey, the country home of Viscount Mountbatten.

Queen Elizabeth and Prince Philip ride in the Golden State Carriage at the head of a parade from Buckingham Palace to St Paul's Cathedral celebrating the Queen's Golden Jubilee on June 4, 2002. Photo / Getty Images

Queen Elizabeth II seated upon the throne at her coronation in Westminster Abbey, London. Photo / Getty Images

The Queen on her coronation day in 1953.

Queen Elizabeth II inspects a Guard of Honour outside the Canadian Parliament in 2010. Photo / Getty Images

Queen Elizabeth II on the balcony of Buckingham Palace after her coronation ceremony. Photo / Getty Images

Prince Charles, watched by Queen Elizabeth II, places a gold coronet on his head at his investiture as Prince of Wales in 1969 in Caernarvon, Wales. Photo / Getty Images

Queen Elizabeth II and Prince Philip, Duke of Edinburgh take part in a parade down The Mall during "The Patron's Lunch" celebrations for The Queen's 90th birthday on June 12, 2016. Photo / Getty Images

The Queen inspecting the Grenadier Guards in July 1968. Photo / Getty Images

The Queen makes her way along The Mall during the Trooping the Colour ceremony in London. Photo / Getty Images

On the balcony at Buckingham Palace during the Trooping the Colour in 1985. Photo / Getty Images

Queen Elizabeth and Prince Philip ride in the Golden State Carriage at the head of a parade from Buckingham Palace to St Paul's Cathedral celebrating the Queen's Golden Jubilee on June 4, 2002. Photo / Getty Images

Queen Elizabeth II seated upon the throne at her coronation in Westminster Abbey, London. Photo / Getty Images

The Queen on her coronation day in 1953.

Queen Elizabeth II inspects a Guard of Honour outside the Canadian Parliament in 2010. Photo / Getty Images

Queen Elizabeth II on the balcony of Buckingham Palace after her coronation ceremony. Photo / Getty Images

Prince Charles, watched by Queen Elizabeth II, places a gold coronet on his head at his investiture as Prince of Wales in 1969 in Caernarvon, Wales. Photo / Getty Images

Queen Elizabeth II and Prince Philip, Duke of Edinburgh take part in a parade down The Mall during "The Patron's Lunch" celebrations for The Queen's 90th birthday on June 12, 2016. Photo / Getty Images

The Queen inspecting the Grenadier Guards in July 1968. Photo / Getty Images

The Queen makes her way along The Mall during the Trooping the Colour ceremony in London. Photo / Getty Images

On the balcony at Buckingham Palace during the Trooping the Colour in 1985. Photo / Getty Images

Wearing a traditional korowai, the Queen is welcomed during her Silver Jubilee Tour of New Zealand in 1977. Photo / Getty Images

Queen Elizabeth II meets entertainers during her 1981 tour of New Zealand. Photo / NZ Herald

The Queen waves to the crowd from the front of the Auckland Town Hall in 1953. Photo / NZ Herald

Queen Elizabeth at a children's gathering at Athletic Park, Wellington, in 1954. Photo / NZ Herald

The Queen receives a bouquet from Anne Te Aurere Rogers at Waitangi in December, 1953. Photo / NZ Herald

The Queen and the Duke of Edinburgh are cheered by a crowd of children waving flags at a picnic at Forbury Park race course, Dunedin, in 1954. Photo / Getty Images

Queen Elizabeth II and Prince Philip (background, centre) receive a Maori challenge as they pass through the Royal Arch at Arawa Park, Rotorua. Photo / Getty Images

Queen Elizabeth II waving and holding bouquet of roses, in New Zealand in 1954. Photo / NZ Herald

Queen Elizabeth II wearing a korowai during her visit to New Zealand, 1977. Photo / Getty Images

The Queen greets Jacinda Ardern at a formal dinner during the Commonwealth Heads of Government Meeting in 2018. Photo / Getty Images

Wearing a traditional korowai, the Queen is welcomed during her Silver Jubilee Tour of New Zealand in 1977. Photo / Getty Images

Queen Elizabeth II meets entertainers during her 1981 tour of New Zealand. Photo / NZ Herald

The Queen waves to the crowd from the front of the Auckland Town Hall in 1953. Photo / NZ Herald

Queen Elizabeth at a children's gathering at Athletic Park, Wellington, in 1954. Photo / NZ Herald

The Queen receives a bouquet from Anne Te Aurere Rogers at Waitangi in December, 1953. Photo / NZ Herald

The Queen and the Duke of Edinburgh are cheered by a crowd of children waving flags at a picnic at Forbury Park race course, Dunedin, in 1954. Photo / Getty Images

Queen Elizabeth II and Prince Philip (background, centre) receive a Maori challenge as they pass through the Royal Arch at Arawa Park, Rotorua. Photo / Getty Images

Queen Elizabeth II waving and holding bouquet of roses, in New Zealand in 1954. Photo / NZ Herald

Queen Elizabeth II wearing a korowai during her visit to New Zealand, 1977. Photo / Getty Images

The Queen greets Jacinda Ardern at a formal dinner during the Commonwealth Heads of Government Meeting in 2018. Photo / Getty Images

Queen Elizabeth ll looks at the views at Inspiration Point in the Yosemite National Park during a tour of the USA on March 05 1983. Photo / Getty Images

The Queen is rowed ashore in Tuvalu in 1982. Photo / Getty Images

Princess Elizabeth (as she was then) and Prince Philip wave to a cheering crowd in front of the Capitol Theatre in Hamilton, Ontario, Canada, in 1951. Photo / Getty Images

The Queen is greeted by cheering crowds as she descends from her plane in Malawi in 1979. Photo / Getty Images

Feeling the downdraft from a helicopter at Winnipeg during a royal tour of Canada, July 1970. Photo / Getty Images

Meeting indigenous leaders during her visit to Canada in July of 1976. Photo / Getty Images

Queen Elizabeth II waves as she is driven through the streets of Karachi in an open topped car, during her 1961 visit to Pakistan. Photo / Getty Images

Queen Elizabeth II inspects men of the newly-renamed Queen's Own Nigeria Regiment during her Commonwealth Tour in 1956. Photo / Getty Images

Queen Elizabeth ll shuffles herself along in a traditional Indain 'Palki' during her visit to India in November of 1983. Photo / Getty Images

Visiting Honiara, the capital of the Solomon Isles during a 1982 Commonwealth Tour. Photo / Getty Images

Queen Elizabeth ll looks at the views at Inspiration Point in the Yosemite National Park during a tour of the USA on March 05 1983. Photo / Getty Images

The Queen is rowed ashore in Tuvalu in 1982. Photo / Getty Images

Princess Elizabeth (as she was then) and Prince Philip wave to a cheering crowd in front of the Capitol Theatre in Hamilton, Ontario, Canada, in 1951. Photo / Getty Images

The Queen is greeted by cheering crowds as she descends from her plane in Malawi in 1979. Photo / Getty Images

Feeling the downdraft from a helicopter at Winnipeg during a royal tour of Canada, July 1970. Photo / Getty Images

Meeting indigenous leaders during her visit to Canada in July of 1976. Photo / Getty Images

Queen Elizabeth II waves as she is driven through the streets of Karachi in an open topped car, during her 1961 visit to Pakistan. Photo / Getty Images

Queen Elizabeth II inspects men of the newly-renamed Queen's Own Nigeria Regiment during her Commonwealth Tour in 1956. Photo / Getty Images

Queen Elizabeth ll shuffles herself along in a traditional Indain 'Palki' during her visit to India in November of 1983. Photo / Getty Images

Visiting Honiara, the capital of the Solomon Isles during a 1982 Commonwealth Tour. Photo / Getty Images

US President Gerald Ford dancing with Queen Elizabeth II at a White House ball in 1976. Photo / Getty Images

The Queen and Prince Philip exchange gifts with Pope Francis in 2014. Photo / Getty Images

The Queen and US President Donald Trump arrive for a state banquet at Buckingham Palace in 2019. Photo / Getty Images

The Queen with Nelson Mandela at a banquet in Cape Town, South Africa, in 1995. Photo / Getty Images

Hosting US President John Kennedy at Buckingham Palace in 1961. Photo / John F Kennedy Presidential Library

Horse riding with US President Ronald Reagan in the grounds of Windsor Castle in 1982. Photo / Getty Images

The Queen presents the Order of Merit to Mother Teresa at the Presidential Palace in Delhi in 1983. Photo / Getty Images

US President Barack Obama and his wife First Lady Michelle Obama are greeted by Queen Elizabeth II and Prince Phillip after landing by helicopter at Windsor Castle in 2016. Photo / Getty Images

The Queen receives Canada's Prime Minister Justin Trudeau during an audience at Windsor Castle in 2022. Photo / AP

US President Gerald Ford dancing with Queen Elizabeth II at a White House ball in 1976. Photo / Getty Images

The Queen and Prince Philip exchange gifts with Pope Francis in 2014. Photo / Getty Images

The Queen and US President Donald Trump arrive for a state banquet at Buckingham Palace in 2019. Photo / Getty Images

The Queen with Nelson Mandela at a banquet in Cape Town, South Africa, in 1995. Photo / Getty Images

Hosting US President John Kennedy at Buckingham Palace in 1961. Photo / John F Kennedy Presidential Library

Horse riding with US President Ronald Reagan in the grounds of Windsor Castle in 1982. Photo / Getty Images

The Queen presents the Order of Merit to Mother Teresa at the Presidential Palace in Delhi in 1983. Photo / Getty Images

US President Barack Obama and his wife First Lady Michelle Obama are greeted by Queen Elizabeth II and Prince Phillip after landing by helicopter at Windsor Castle in 2016. Photo / Getty Images

The Queen receives Canada's Prime Minister Justin Trudeau during an audience at Windsor Castle in 2022. Photo / AP

A playful 1951 family portrait with a young Charles and Anne. Photo / Bettmann Archive

Queen Elizabeth II driving her children Prince Charles and Princess Anne at Windsor in 1957. Photo / Getty Images

A family portrait at Buckingham Palace for the Queen and Prince Philip's 1972 silver wedding anniversary. Photo / Getty Images

The Queen with Prince William and Prince Harry in the royal box at Guards Polo Club, Windsor, in 1987. Photo / Getty Images

The Queen with Prince Charles and Lady Diana Spencer at Buckingham Palace in 1981. Photo / Getty Images

With Meghan, Duchess of Sussex at a ceremony to open the new Mersey Gateway Bridge in 2018. Photo / Getty Images

The Princess of Wales and the Queen attend the Opening of Parliament in London, November 1982. Photo / Getty Images

A 90th birthday portrait of the Queen, Prince Charles, Prince William and Prince George in 2016. Photo / Royal Mail

The Queen and Prince Philip fly back from a visit to Yorkshire in 1969. Photo / Bettmann Archive

(From left) Princess Michael Of Kent, Princess Anne, the Queen and the Queen Mother at the Derby Races in 1988. Photo / Getty Images

A playful 1951 family portrait with a young Charles and Anne. Photo / Bettmann Archive

Queen Elizabeth II driving her children Prince Charles and Princess Anne at Windsor in 1957. Photo / Getty Images

A family portrait at Buckingham Palace for the Queen and Prince Philip's 1972 silver wedding anniversary. Photo / Getty Images

The Queen with Prince William and Prince Harry in the royal box at Guards Polo Club, Windsor, in 1987. Photo / Getty Images

The Queen with Prince Charles and Lady Diana Spencer at Buckingham Palace in 1981. Photo / Getty Images

With Meghan, Duchess of Sussex at a ceremony to open the new Mersey Gateway Bridge in 2018. Photo / Getty Images

The Princess of Wales and the Queen attend the Opening of Parliament in London, November 1982. Photo / Getty Images

A 90th birthday portrait of the Queen, Prince Charles, Prince William and Prince George in 2016. Photo / Royal Mail

The Queen flies back from a visit to Yorkshire in 1969. Photo / Bettmann Archive

The Queen and Princess Anne at the Derby Races in 1988. Photo / Getty Images

Queen Elizabeth II leads in her first classic winner, Carrozza, after the filly's victory in the Oaks at Epsom in 1957. Photo / Getty Images

The Queen with her dog Wren at the Open Stake Retriever Trials at Balmoral in 1967. Photo / Getty Images

Laughing at the 1980 Royal Windsor Horse Show. Photo / Getty Images

At the Windsor Horse show in 1984. Photo / Supplied

Queen Elizabeth II in the crowd, watching the Carriage Driving event at the Windsor Horse Show in 1984. Photo / Getty Images

The Queen, Princess Margaret and Prince Edward riding at Ascot Racecourse in 1968. Photo / Getty Images

Off duty at the 1975 Badminton Horse Trials. Photo / Getty Images

With the Duke of Edinburgh on their Sandringham estate, Norfolk, in 1982. Photo / Getty Images

Watching Prince Philip competing at the Royal Windsor Horse Show at Home Park in Windsor, Berkshire, in 1982. Photo / Getty Images

Queen Elizabeth II leads in her first classic winner, Carrozza, after the filly's victory in the Oaks at Epsom in 1957. Photo / Getty Images

The Queen with her dog Wren at the Open Stake Retriever Trials at Balmoral in 1967. Photo / Getty Images

Laughing at the 1980 Royal Windsor Horse Show. Photo / Getty Images

With Prince Philip at the Windsor Horse show in 1984. Photo / Supplied

Queen Elizabeth II in the crowd, watching the Carriage Driving event at the Windsor Horse Show in 1984. Photo / Getty Images

The Queen riding at Ascot Racecourse in 1968. Photo / Getty Images

Off duty at the 1975 Badminton Horse Trials. Photo / Getty Images

With the Duke of Edinburgh on their Sandringham estate, Norfolk, in 1982. Photo / Getty Images

Watching Prince Philip competing at the Royal Windsor Horse Show at Home Park in Windsor, Berkshire, in 1982. Photo / Getty Images

Queen of New Zealand - an official portrait, taken at Buckingham Palace in 2011 and released in 2012 to mark her diamond jubilee. Photo / Supplied

The Queen peers round a corner of the Royal Albert Hall during a tour of the concert hall in 2004. Photo / Getty Images

The Queen surrounded by students at Evora University during an official tour of Portugal in 1985. Photo / Getty Images

The Queen travels from Buckingham Palace to the Palace of Westminster in the horse-drawn Irish state coach to attend the state opening of Parliament in 2007. Photo / Getty Images

Queen Elizabeth II at a reception to celebrate the start of her Platinum Jubilee in February 2022. Photo / AP

The Queen watches as pallbearers carry the coffin of her late husband Prince Philip into St George’s Chapel for his funeral in April 2021. Photo / Getty Images

The Queen at the wheel of her Range Rover car as she attends the Royal Windsor Horse Show in July 2021. Photo / Getty Images

The Queen takes a photo of Prince Philip competing at the Windsor Horse Show in 1982. Photo / Getty Images

Queen Elizabeth II smiles as she visits Cyfarthfa High School and Castle in Merthyr, Wales, in 2012. Photo / Getty Images

Queen of New Zealand - an official portrait, taken at Buckingham Palace in 2011 and released in 2012 to mark her diamond jubilee. Photo / Supplied

The Queen peers round a corner of the Royal Albert Hall during a tour of the concert hall in 2004. Photo / Getty Images

The Queen surrounded by students at Evora University during an official tour of Portugal in 1985. Photo / Getty Images

The Queen travels from Buckingham Palace to the Palace of Westminster in the horse-drawn Irish state coach to attend the state opening of Parliament in 2007. Photo / Getty Images

Queen Elizabeth II at a reception to celebrate the start of her Platinum Jubilee in February 2022. Photo / AP

The Queen watches as pallbearers carry the coffin of her late husband Prince Philip into St George’s Chapel for his funeral in April 2021. Photo / Getty Images

The Queen at the wheel of her Range Rover car as she attends the Royal Windsor Horse Show in July 2021. Photo / Getty Images

The Queen takes a photo of Prince Philip competing at the Windsor Horse Show in 1982. Photo / Getty Images

Queen Elizabeth II smiles as she visits Cyfarthfa High School and Castle in Merthyr, Wales, in 2012. Photo / Getty Images

A drone display over Buckingham Palace spells out the message. Photo / Getty Images

Crowds fill The Mall as they wait for the royal family to appear on the balcony of Buckingham Palace. Photo / AP

Prince Louis steals the show as four generations of the Royal Family gather on the balcony of Buckingham Palace. Photo / AP

Queen Elizabeth sits down for tea with Paddington Bear at Buckingham Palace. Photo / AP

A street party in Cardiff, Wales. Photo / Getty Images

The Royal Family wave from the balcony of Buckingham Palace. Photo / Getty Images

A closing aerial tribute from the 70th jubilee celebrations in June 2022. Photo / Getty Images

A drone display over Buckingham Palace spells out the message. Photo / Getty Images

Crowds fill The Mall as they wait for the royal family to appear on the balcony of Buckingham Palace. Photo / AP

Prince Louis steals the show as four generations of the Royal Family gather on the balcony of Buckingham Palace. Photo / AP

The crowd watches a film of the Queen having tea with Paddington Bear on a big screen in front of Buckingham Palace. Photo / Getty Images

A street party in Cardiff, Wales. Photo / Getty Images

The Royal Family wave from the balcony of Buckingham Palace. Photo / Getty Images

A closing aerial tribute from the 70th jubilee celebrations in June 2022. Photo / Getty Images