Princess Diana's private photos released by Wills and Harry

By Ellen Whinnett in London, News Corp Australia Network

Prince William and Prince Harry have released new photographs of their mother, Princess Diana, to mark the 20th anniversary of her death, reports News.com.

The princes released three photos from Princess Diana's personal photo album to coincide with a documentary which airs in London tomorrow, called Diana: Our Mother: Her Life and Legacy.

One of the photographs shows Princess Diana holding young son William. She was pregnant with Prince Harry at the time the photograph was taken.

Princes William and Harry have released new photos of Princess Diana. Photo / Supplied

A second photograph shows Princess Diana and Harry enjoying a holiday together.

Prince Harry released this image of him and his mother, taken from Diana's personal photo album. Photo / Supplied

The third photo Princess Diana had kept in her album is of her two sons, William and Harry, sitting on a park bench.

The documentary and the release of the photographs come ahead of the 20th anniversary of Princess Diana's death in a car crash in Paris on August 31, 1997.

She was just 37 years old when she died.

The late Diana, Princess of Wales, holding Prince William while pregnant with Prince Harry. Photo / supplied.

A statement from Kensington Palace said the princes were pleased to share the photographs from their mother's private album.

The 90-minute documentary, made by Oxford Film and Television, celebrates the life and work of Princess Diana, which will screen on ITV in the UK on Monday night at 9pm GMT.

In the film, Prince William and Prince Harry are shown going through photo albums and recalling fond memories from their childhood.