While the cost of this year’s event has not been confirmed, it was revealed by the Ministry of Defence in 2021 that it cost them £59,662.70 that year for Trooping the Colour - a fact that was revealed after a freedom of information request.

Senior working royals including Prince William, Kate Middleton, Princess Anne, Prince Edward and Queen Camilla will reportedly take part in the king's birthday parade.

The Royal family marked King Charles’ official birthday with the annual Trooping the Colour ceremony in London where the monarch was joined by Prince William, Princess Catherine and their three children.

Ahead of Saturday's festivities, King Charles III also honored a handful of celebrities and public figures, including David Beckham, Gary Oldman and Elaine Paige.

Prince George, Princess Charlotte and Prince Louis made an appearance on the Buckingham Palace balcony for Trooping the Colour. See the best photos of the royal siblings.

As per the British Army website, the ceremony of Trooping the Colour is thought to have first taken place during the reign of King Charles II in the 17th century. In 1748 it was decided that it would be used to mark the Sovereign’s official birthday.