Kate Middleton is joining King Charles and Queen Camilla in a significant position at Trooping the Color. Why Princess Kate is with the King at Horse Guards Parade.

The parade travels from Buckingham Palace down The Mall to Horse Guards Parade. Then, following tradition, Charles, Queen Camilla, 77, and other work members of the royal family stoof on the Buckingham Palace balcony to watch a flypast. As the family headed back inside Buckingham Palace, Prince Louis turned and gave the crowd one final wave.

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.

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.

Britain's King Charles and Queen Camilla ride a carriage as part of the Trooping the Colour parade which honours King Charles on his official birthday, in London, Britain,. REUTERS/Isabel Infantes LONDON (Reuters) -Britain's King Charles and other senior royals wore black armbands at the "Trooping the Colour" military parade on Saturday as a mark of respect for the victims of the Air India plane crash.