Meghan, Harry and the other members of the royal family took their place in Wellington's former office which overlooks the parade ground.
Since her first appearance in 1981, Princess Diana also maintained royal tradition by wearing dresses with sleeves that went past her elbows during the Queen's public birthday celebration.
In the ceremonial celebration of the queen's birthday, which is actually in April, over 1,400 parading soldiers, 200 horses and 400 musicians come together each June in a display of military precision and horsemanship.
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Meghan looked chic in a dress by Carolina Herrera and a hat by Philip Treacy, while Kate was stylish in an Alexander McQueen dress and a hat by Juliette Botterill.
The short-sleeve number defied the customary long sleeve variations sister-in-law Kate Middleton has worn since her Trooping debut in 2011. She is due to join Queen Elizabeth in Cheshire for her first solo appearance alongside the Queen on Thursday. Since then, the couple du jour have jetted off to a top-secret honeymoon destination (Psst, it was reportedly in Ireland). Queen Elizabeth and Prince Philip stayed their in 2005.
In Cheshire, they'll undertake classic royal duties: opening a bridge, officially cutting a ribbon at a cultural centre that's actually been going since past year, and finally, a lunch at the Chester Town Hall.