Prince George turns 5: A celebration of his sweetest moments

This year, Prince George got to a brand-new baby brother... And we can already tell how much he loves being the eldest.

George looked very grown-up in a miniature version of the Blues and Royals frockcoat at his uncle Prince Harry's wedding.

Royal rascals! This moment warmed the world's heart and we discovered how close George is to his cousin Savannah...

Thick as thieves.

Stepping up for big brother patrol at Prince Louis' christening.

It feels like only yesterday George was getting baptised.

Last year, to mark his fourth birthday, the proud parents released this heartwarming portrait of George.

Prince George was a mini-William during the royal tour of Poland...

But the little poppet did have some tough times.

In fact, we saw his not-fussed nature at Aunt Pippa's wedding.

During the royal tour of Canada in 2016, George and his little sister charmed the nation's heart.

Cuddles with dad.

In 2016, to commemorate his third birthday the royal family released these stunning new shots, taken by Matt Porteous. In this image, George plays on a swing that has his parents' names engraved on it. (Image/Matt Porteous)

The young Prince tries to feed the family dog, Lupo, some of his ice cream! "I really enjoyed the opportunity to take these photographs of Prince George. It was a very relaxed and enjoyable atmosphere," Matt Porteous explained. (Image/Matt Porteous)

The beautiful shots, which were shared on the Royal Family's official Facebook page, were taken at the Cambridge's Norfolk home in mid-July. "The Duke and Duchess hope that people will enjoy seeing these new photographs. They would like to thank everyone for all the lovely messages they have received as Prince George celebrates his third birthday," the official statement explained. (Image/Matt Porteous)

Who can forget when George took over the Royal International Air Tattoo.

Check out that smile!

Prince George adores the planes at Trooping The Colour.

Who can forget when Prince George started nursery school at the Westacre Montessori School.

Then last year, he reached another milestone with his very first day of school at Thomas's Battersea in London.

A baby George was chuffed when he was given an oversized wombat from the Australian Governor-General Peter Cosgrove during the Cambrdige's tour of Australia three years ago.

"He's got quite a strong grasp, so we were worried about [him meeting the bilby in Australia]," Catherine laughed.

Cuddles galore! Little Georgie is a doting big brother who loves giving kisses for his darling sister, Princess Charlotte Elizabeth Diana of Cambridge.

He certainly has mastered the royal wave.

And his Gan Gan simply adores him.

While grandfather Prince Charles enjoys gardening with him.

In 2014, the Royal Family presented the world with the cutest Christmas gift of all - this official series of snaps featuring Prince George casually hanging out in the courtyard at Kensington Palace.

Is there anything sweeter than father-son dressing in coordinating blue ensembles?

The cutie from Cambridge is always ready for adventure.

Aunt Pippa Middleton has admitted: "It's wonderful. He's amazing. He's a very, very dear boy. And he's brought a lot of pleasure and fun for all of us, the whole family. He's very characterful. He's sort of brought us all together, and we love spending weekends with him. He's very funny."

As a bub, Prince George had the most scrumptious chubby cheeks.

The George effect! Shortly after the Cambridges released this family photo for Mother's Day, parents flocked to buy jumpers with their little one's name emblazoned across it, just like the one George wears by designers My1stYears in the happy snap.

According to Uncle Harry, George "looks like a young Winston Churchill." While Wills sees himself and his younger brother. Either way, little George has mastered his best angles.

Sometimes, it can all get a bit too much! George has a cry at his sister's christening in 2015.

"She always leaves a little gift or something in their room when we go and stay and that just shows her love for her family," Duchess Catherine has revealed of The Queen.

George also has a close bond with his nanny, Maria Borrallo.

Everywhere he goes, people are drawn to him!

Crawling in the deep... Meet the real Curious George.

According to mum Catherine, George is obsessed with anything that has wheels.

"Come along, mother! We've got places that need to be explored!"

Kisses for Charlotte! Shortly after her birth in 2015, George showed off his impressive big brother skills in these touching portraits.

The third in line to the British throne has inherited his dad's love of helicopters.

George looked adorable in a bespoke dressing gown with his name on it when he met President Obama.

Look at me go! George showed off his rocking horse skills as Duchess Catherine proudly clapped him on. The toy was given to George from The Obamas when he was born.

Prince George, future King of England, current King of the Sassy Face. Bow down!

And the ULTIMATE Duke of Funny Faces.

"Right, left, right!" Wills admitted that Prince George "never stops moving."

The cherubic bub at his 2013 christening.

The Duke and Duchess of Cambridge want their kids to have a normal upbringing.

The first official family photo of the Cambridges, which was released in August 2013 and taken by Michael Middleton.

No doubt the adorable siblings will get up to all sorts of mischief on the Prince's birthday.

A very happy birthday day, George!