Harry and Meghan passed another royal milestone as husband and wife when they joined the Queen in acknowledging the crowds gathered in the Mall following the traditional ceremony to mark her official birthday.
The event was attended by other senior royals including the Queen, Prince Charles and the Duke and Duchess of Cambridge.
Her actual birthday is April 21 but the country always celebrates in June.
While Harry and Meghan's premier tour has caused a buzz of excitement in the global media, fears have been raised about the couple's desire to start a family as soon as possible.
While the chaos of the royal wedding may be over, Meghan Markle's role as a fully-fledged member of the British royal family is only just beginning.
They rode in on a horse-drawn carriage and looked very royal.
Instagram princesseugenieShe shared the snap ahead of Father's Day this weekend reportedly very close to her father
Meghan looked stunning in a blush dress by Venezuelan designer Carolina Herrera, which was paired with a flat-brimmed hat in the same shade.
On Saturday, the Queen, who last month had a successful day procedure to remove a cataract, left Buckingham Palace at 10.45am (local time) for the ceremony.
Despite her apparent nerves, Meghan was in high spirits when she arrived on House Guards Parade with Harry in a carriage, along with the Queen's cousin the Duke of Kent.
Harry and Meghan have been invited to Australia and New Zealand by the countries' respective governments, while the royals will visit Fiji and Tonga at the request of the Foreign and Commonwealth Office, the official statement from Kensington Palace stated.
The tour, believed to be the pair's honeymoon, falls on the occasion of the fourth Invictus Games, which is held in Sydney from October 20-27.