Prince George's fourth birthday

Prince George Alexander Louis of Cambridge (and his gorgeous chubby cheeks) is officially a four year old.

When did this happen?

We still remember when he entered the world on July 22nd, 2013 – effectively ending the first #GreatKateWait until Princess Charlotte came along.

It’s been a jam-packed four years for the charming tot, who in his short time has become a loving big brother, a fashion icon, the world’s number one spirit animal thanks to his huge range of sweet faces.

To mark his birthday, Kate and Wills released this stunning portrait of George.

Let’s not forget his starring role in the historic photoshoot for The Queen’s 90th, how he stepped up his official royal duties and his love for royal tours.

The birthday boy will no doubt be all tuckered out following his very hectic royal tour of Poland and Germany.

The Palace have yet to comment on what the youngster has planned but given her Middleton party planning background, we envision Catherine will keep it low-key with a tea party at their Kensington Palace apartment.

Happy fourth birthday Prince George! Scroll through the gallery to check out his cutest moments.

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Prince George was 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 Aunty Pippa’s wedding.

During the Canada royal tour, young George was a cheeky little monkey.

Cuddles with dad.

Last year, 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.

He’s a big boy now! Earlier this year, Prince George started nursery school at the Westacre Montessori School.

Who could forget his first official engagement at Government House in Wellington, New Zealand in 2014.

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 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 in April this year.

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.