The pair joined Queen Elizabeth, Prince William, Kate Middleton, Prince Charles, Camilla, Duchess of Cornwall for the Festival of Remembrance Service at Royal Albert Hall in London.
The event is held the day before Remembrance Sunday to commemorate all who have lost their lives in war.
Meghan, Harry, Kate and William are expected to attend the annual Remembrance Day Service at The Cenotaph in observance of Remembrance Sunday.
The appearance of all four royals comes as news surfaced that Prince William and Prince Harry are “breaking up their joint court at Kensington Palace” and creating two separate offices.
“The arrival of Meghan has changed the dynamic of the relationship in a fairly significant way,” royals author Sally Bedell Smith told PEOPLE.com. “It is inevitable and practical because it gives Harry and Meghan some freedom to build up their own collection of interests and charities.”