Prince George may be celebrating his sixth birthday today on the private Caribbean Island of Mustique, but the rest of the world is sharing in his day thanks to new photos taken by his mother Kate Middleton.

Kensington Palace shared three new snaps of George with the Duke and Duchess of Cambridge’s 9.7 million Instagram followers on Monday.

The casual photos taken by Kate, who has a tradition of being behind the camera for her children’s birthday album snaps, show George smiling widely to reveal missing teeth.

Two photos were taken recently in the garden at Kensington Palace, where the Cambridges live in Apartment 1A.

In one, the third in line to the throne (wearing the white England home soccer top) is lying on grass and laughing. He’s grinning again in a second photo in the same outfit.

The third picture shows George with tousled hair in a polo top and striped shorts.

“This photograph was taken on holiday with the family by the Duchess of Cambridge,” said the caption.

“Thank you everyone for all your lovely messages!”

The Duke and Duchess of Cambridge are very pleased to share new photographs of Prince George to mark His Royal Highness's sixth birthday 🎈 pic.twitter.com/BIxoxdw3ap

— The Prince and Princess of Wales (@KensingtonRoyal) July 21, 2019

The July 22, 2013 birth of Prince George Alexander Louis of Cambridge literally stopped traffic outside the private Lindo Wing of St Mary’s Hospital, Paddington.

The world’s media camped outside for days to capture the first photos of the prince, who made his public debut at one day old, carried by new mother Kate.

William and Kate introduce Prince George to the world on July 23, 2013. Photo: Getty

George and the family are holidaying on Mustique, where Kate and William have previously spent time with her parents Carole and Michael Middleton.

The royals “enjoyed snorkeling, scuba diving, cocktails and tennis on their past trips”, reported The Mirror.

A no-fly zone is reportedly enforced on the island, which was a favourite retreat for Princess Margaret’s, which means paparazzi photos can’t be taken via drone.

“It is incredibly private and incredibly discreet but not remote. They know and trust the staff who work there and they are creatures of habit,” a royals source told The Sun.

“It’s about as close as they can come to without going to total wilderness.

William drops George off on his first day of school on July 7, 2017. Photo: Getty

“To go to a place with two bars and a few other people, and not feel totally isolated Mustique is perfect.”

When the UK school year starts in September, George will be joined at Thomas’s Battersea by sister Princess Charlotte, 4.

The pair, with brother Louis, 1, had summer fun at the polo on July 10, watching their father play a charity match against their Uncle Harry.

They ate a picnic in the back of the family’s Audi and “George seemed to be saying, ‘Charlotte pass me the sandwiches,'” a witness told People.

“Kate was asking Charlotte to pass little pots of food and she also helped herself to food.”

Louis tried to amuse ten-week-old cousin Archie by wearing his mother’s sunglasses and making faces.

Kate with the three kids at the polo in Berkshire on July 10. Photo: Getty

George and Charlotte also had a day out with grandmother Carole at a village festival on July 13 when their mother was at Wimbledon with Meghan Markle.

“They were having such fun going from stall to stall, playing on all the games,” a local told People.

“George did pretty well at the ‘crockery smash’ stall. He looked very pleased with himself.”