The Duchess of Sussex is now on maternity leave and is not expected to take up any official royal engagements until the end of the summer. Kate and Camilla could apparently be seen awaiting the return of the monarch on the balcony of Buckingham Palace alongside other senior members of the Royal Family.
The annual event brings together over 1,400 parading soldiers, 200 horses and 400 musicians to honor Queen Elizabeth II's official birthday.
During a March visit to a Blackpool, the royal parents visited a park that had been transformed from a place where addicts once congregated to a family-friendly playground.
William and Catherine took turns holding their youngest child as the royal family watched the traditional Royal Air Force flyover on the balcony of Buckingham Palace.More news: Passenger aboard Pakistani flight accidentally opens emergency door; several people offloaded
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Prior to the balcony appearance, photographers took snaps of Prince Louis peering out the window at the waiting crowds with his big sister, Prince Charlotte.
Louis, who only last month was shown in pictures walking for the first time, appears to be a natural as he lapped up the applause from thousands of royal fans outside the palace gates. But there was one moment that didn't go unnoticed, when she was reunited with her nephew, Prince George.
Upon introducing Archie to the public last month, Markle said her son was "a dream" and had "the sweetest temperament". The couple's first baby, son Archie, was born just over a month ago.
Archie Harrison Mountbatten-Windsor didn't attend the event today.