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?

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.

Prince Louis charmed again at Trooping the Colour. See Kate Middleton and Prince William's son wave, laugh and smile (with his new teeth!) at the King's birthday parade.

"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.

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.

Rain or shine, Trooping the Colour is a magnificent sight to behold and is a highlight of the royal calendar every year. It’s one of the rare times we get to see so many members of the Royal Family make an appearance together on the Buckingham Palace balcony - or just together in general,

Kate Middleton proved she kicked cancer's butt as she radiated pure joy at London's Trooping the Colour ceremony on Saturday, June 14. The Princess of Wales showed the world she's going no where when it comes to her prominence in the royal family while appearing at the ceremonial military parade for the first time since announcing her cancer