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.

The British royals were out in full force at Trooping the Colour on Saturday. But did you spot that Lord and Lady Frederick Windsor were also in attendance?

"Set with diamonds, sapphires, rubies and emeralds, the bejewelled piece features the cypher of her father, King George VI," Zack Stone, a fine jewelry expert from U.K. retailer Steven Stone, shared with WWD.

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 photos are rolling in from today's Trooping the Colour event, and its clear the Royal Family (or at least the members who were there) came coordinated and ready to show off a united front! Town & Country's article covering the event includes a ton of great images showing off Princess Catherine's beautiful turquoise dress,

Saturday’s event may be steeped in pomp and pageantry, but it carries deeper meaning for the British monarchy.

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.

The Duke and Duchess of Edinburgh's son, James, Earl of Wessex, did not join the rest of the Royal Family at Trooping the Colour for the third time. His last appearance at the event came in 2022 when Queen Elizabeth II marked her historic Platinum Jubilee.