The Queen then inspects the troops before heading back to Buckingham Palace where she's joined by the Royal Family.
On Saturday, Meghan was pictured wearing a pale pink dress with matching hat, while Harry was in military uniform.
Featuring 1400 parading soldiers from the royal household divisions, 200 horses and 400 musicians, the annual Trooping the Colour parade dates back at least 260 years and is a marvellous display of British royal pomp and pageantry.
Meghan, Harry and the other members of the royal family took their place in Wellington's former office which overlooks the parade ground. But now that Prince Philip, 97 on Sunday, has retired, she's taking relatives more and more frequently.
The guardsman said his family, including his mother, father and sister, who are "really, really proud" of him, will be there to watch him take part. In attendance included Queen Elizabeth, Prince Philip, The Prince of Wales, The Duchess of Cornwall, The Duke and Duchess of Cambridge as well as the newlyweds, The Duke and Duchess of Sussex.
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Britain's Prince Harry, Duke of Sussex and Britain's Meghan, Duchess of Sussex travel in a horse-drawn carriage down The Mall to Horseguards parade ahead of the Queen's Birthday Parade, "Trooping the Colour", in London on June 9, 2018.
The Trooping the Colour is a ceremony performed by regiments of the British and Commonwealth armies to mark the official birthday of the British sovereign. Meghan's already looking fully at ease. laughing and smiling with her father-in-law and Kate.
The Duchess added a pair of drop earrings to her reliably chic wardrobe choice and teamed it with one of her timeless staples - heeled court shoes. She is due to join Queen Elizabeth in Cheshire for her first solo appearance alongside the Queen on Thursday. Or rather, why isn't Prince Harry on horseback? That Kate and Queen trip to Leicester came almost a year after her marriage to Prince William.
The colour trooped this year was the flag of the 1st Battalion Coldstream Guards.