While Queen Elizabeth II celebrated her actual birthday on April 21, the Trooping of the Colour takes place on any Saturday of June.
Their public appearance together followed media speculation in recent weeks that they had been on honeymoon, although Kensington Palace, Harry's office, has not provided details of any trip.
Ok so for those of you who are wondering what Trooping the colour is and how did it began?
A Buckingham Palace spokesman said: "I can confirm that the Queen successfully underwent a short planned procedure to treat a cataract last month". It originated from traditional preparations for battle when flags, or colors, were "trooped" so soldiers in the ranks would be able to recognize them.More news: ZTE signs preliminary agreement to lift USA ban
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Markle previously raised a select few eyebrows with her choice of wedding dress, which also let a bit of shoulder peek through.
Queen Elizabeth, who still rides ponies at her home at Windsor Castle, rode on horseback in the parade for decades until recent years, when she moved to a carriage.
After they arrived at Buckingham Palace, the stylish sisters joined their other relatives on the famous balcony to watch the Royal Air Force's Red Arrows fly past. But now that Prince Philip, 97 on Sunday, has retired, she's taking relatives more and more frequently. Expect to see Meghan at a carefully chosen selection of them as she continues her introduction to her new life as a senior royal.