Kate Middleton and Prince William have released new photos of birthday boy Prince George, who turns 6 on Monday

Prince George is almost 6!

As the future king prepares to blow out the candles on his cake on Monday, proud parents Kate Middleton and Prince William have released new photos of their birthday boy.

Two of the adorable portraits, in which George wears the official England National Soccer Team jersey, were recently taken by proud mom Kate in the garden of their home at Kensington Palace.

The third — which shows George in a different outfit, a green polo and striped shorts, as he smiles for a more candid moment — was taken while the royal family were on holiday. Kate and William traveled with their kids to the private Caribbean island of Mustique for the royal’s birthday.

The images are the latest addition to the Cambridge family’s special album of memories. William and Kate have issued various portraits of their children over the years to share with the public and thank fans for their birthday wishes.

Prince George
| Credit: The Duchess of Cambridge
Credit: The Duchess of Cambridge
Credit: The Duchess of Cambridge

The young royal has already been enjoying the summer sun, letting loose with Charlotte, 4, and Prince Louis, 1, as dad William, 37, played polo on July 10, and hanging out with cousin Archie. The little royals ended their first public playdate with their baby cousin with a picnic eaten in the back of the family’s Audi.

Catherine Duchess of Cambridge, Prince Louis, Prince George, Princess Charlotte
Kate Middleton, Prince Louis, Prince George and Princess Charlotte
| Credit: Tim Rooke/Shutterstock
Prince George, Meghan Duchess of Sussex, Archie Mountbatten-Windsor
Prince George, Meghan Markle and Archie
| Credit: Tim Rooke/Shutterstock

Kate took a seat on the grass with Louis as George and Charlotte, who wore the Marie-Chantal “Celina” dress, hung out together in the back of the car. “George seemed to be saying, ‘Charlotte pass me the sandwiches.’ Kate was asking Charlotte to pass little pots of food, and she also helped herself to food,” an onlooker told PEOPLE.

And when Princess Kate and Meghan Markle arrived to watch the women’s final at Wimbledon last weekend, George and Charlotte were taken to a village festival in the English countryside by grandmother Carole Middleton.

“They were having such fun going from stall to stall, playing on all the games,” a local villager says, adding: “George did pretty well at the ‘crockery smash’ stall. He looked very pleased with himself.”