The celebrations for Prince George’s 9th birthday have begun!

On Friday, George’s great-grandmother, Queen Elizabeth, dedicated a special social media post to the future King.

“Wishing Prince George a very Happy 9th Birthday!” the Queen, 96, said on Twitter, alongside a photo of the duo during last month’s Platinum Jubilee celebrations.

George, who will one day inherit the throne, stood alongside his great-grandmother on the balcony of Buckingham Palace in early June to commemorate the monarch’s 70 years on the throne.

The Queen also took to Twitter to congratulate the Irish Guards Band for performing “Happy Birthday” in honor of George’s big day. The colonel of the Irish Guards is Prince William.

George’s grandfather Prince Charles and Camilla, Duchess of Cornwall also shared a birthday wish (alongside the cupcake emoji!) for the young royal. 

The Duke and Duchess of Cambridge shared a new photo of the young prince in honor of his special day. The photograph, which mom Kate took, was shot while the family was on holiday in the U.K. earlier this month. 

“George is turning 9!” They shared in a social media post — including the cake and balloon emoji.

Prince George got a fantastic start to his summer by attending the Wimbledon men’s final with his parents last week. George sat in the Royal Box at Centre Court in a suit and tie, and he even got to handle the coveted trophy when the family met champion, Novak Djokovic.

The family will most likely be moving this summer. Kate and Prince William intend to move from Kensington Palace to a new home in Berkshire, the county that houses the Queen’s official residence, Windsor Castle. The family is expected to move into Adelaide Cottage on the Windsor estate, but this has yet to be verified.

That also means that Prince George, Princess Charlotte, and Prince Louis will start a new school in the fall.