The best moments from our tiniest Royals, Charlotte and George

Princess Charlotte of Cambridge and Prince George of Cambridge watch an airshow at Buckingham Palace. Photo / Getty Images

Royal baby number three is on the way for Prince William and the Duchess of Cambridge.

It's been a big four years for the Royal couple who welcomed George in 2013, Charlotte in 2015 and are now set to have baby number three in 2018.

While Kate and William may have their hands full with their two current children, they sure know how to make some pretty adorable kids.

We take a look back at the cutest moments from the tiniest Royals, Prince George and Princess Charlotte.

GEORGE'S BEST MOMENTS

Squishing his nose against a plane window

George melted hearts across the world with this picture of his nose pressed up against a plane window. Photo / Getty Images

Cuddles with mum

Baby Prince George shares a cuddle with Mum. Photo / Getty Images

Cuddles with Dad

There is no shortage of cuddles when George is around. Photo / Getty Images

Having a blast in a helicopter

Little George shares his fathers love of planes and helicopters. Photo / Getty Images

Chatting with Great-granny

George and his Great-Grandma have an adorable chat. Photo / Getty Images

Meeting Barack Obama wearing PJs

George has Obama wrapped around his finger after he demanded to meet him in his pyjamas and robe. Photo / Getty Images

Hanging out on the steps

George made this little soldier vest sell out over night after wearing it in this photo. Photo / Getty Images

Birthday portrait when turning four

This portrait of George with his toothy grin marked his 4th birthday. Photo / Getty Images

Giggles with the nanny

George and his nanny share and adorable moment in the window. Photo / Getty Images

Taking a tumble down the hill

George took a tumble down a grass hill and loved it. Photo / Getty Images

Enjoying a candy-cane

Prince George sucking on a candy cane during Christmas celebrations. Photo / Getty Images

Stealing the show

George and his cheeks went viral during Princess Charlotte's public debut. Photo / Getty Images

CHARLOTTE'S BEST MOMENTS

The big debut

Princess Charlotte wore an adorable bonnet on her public debut. Photo / Getty Images

First public words

Charlotte uttered her first public word "pop" when playing with these balloons. Photo / Getty Images

Looking pretty in pink

View this post on Instagram

The Duke and Duchess of Cambridge are delighted to share new photographs of Princess Charlotte. 📷 copyright of HRH The Duchess of Cambridge.

A post shared by Duke and Duchess of Cambridge (@kensingtonroyal) on May 1, 2016 at 3:00am PDT

Tantrums on the tarmac

All the travel was just too much for Charlotte and she had her first public tantrum while departing Hamburg. Photo / Getty Images

Striking a pose for Mum

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The Duchess took these pictures of her daughter in April at their home in Norfolk. 📷 copyright HRH The Duchess of Cambridge.

A post shared by Duke and Duchess of Cambridge (@kensingtonroyal) on May 1, 2016 at 3:02am PDT

In the snow with Dad

Charlotte wore an adorable pink beanie in the snow with her Dad. Photo / Getty Images

Taking big steps

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The Duke and Duchess are very happy to be able to share these important family moments, ahead of their daughter's first birthday.

A post shared by Duke and Duchess of Cambridge (@kensingtonroyal) on May 1, 2016 at 3:04am PDT

Stopping to smell the flowers

The tiny princess loved the flowers she was gifted so much that she had to stop and smell them right there. Photo / Getty Images

Being Pippa's flower girl

Charlotte aced her duties as aunt Pippa's flower girl. Photo / Getty Images

Second birthday portrait

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The Duke and Duchess of Cambridge are delighted to share a new photograph of Princess Charlotte to mark her second birthday tomorrow. 🎈 The photograph was taken in April by The Duchess at their home in Norfolk. The Duke and Duchess are very pleased to share this photograph as they celebrate Princess Charlotte's second birthday. Their Royal Highnesses would like to thank everyone for all of the lovely messages they have received, and hope that everyone enjoys this photograph of Princess Charlotte as much as they do.

A post shared by Duke and Duchess of Cambridge (@kensingtonroyal) on May 1, 2017 at 2:02am PDT