Watch the performance, along with an ensemble rendition of Louis Armstrong's "What A Wonderful World", capped with a grand stage entrance by the Queen, followed by the audience thrice chanting "hip-hip-hooray" in her honor, below.
While Prince William and Kate Middleton are preparing for the birth of the third child, Prince Harry and Meghan Markle, whose nose wedding (before the wedding less than a month!), as representatives of the Royal family took all the responsibility for performing various official duties.
The event was a break from tradition as the Queen usually celebrates her actual birthday in private. Because of this announcement, Prince Charles will likely represent the queen in an honorary capacity at future commonwealth gatherings. The couple will Wednesday May 19 at Windsor Castle.
The queen's husband, Prince Philip, was also missing.
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The customary gun salutes by the British Army took place midday - "a 41 gun salute in Hyde Park, a 21 gun salute in Windsor Great Park and a 62 gun salute at the Tower of London", according to the Royal Household website.
The concert capped off a week in which leaders and dignitaries from 53 countries came to London for the Commonwealth Heads of Government Meeting, and featured performers from the network of mostly former British colonies.
Britain's Queen Elizabeth II smiles during a visit to the Royal College of Physicians, in London, Feb. 20, 2018.
The queen usually celebrates her birthday in private, saving the pomp for her official birthday in June, but the concert was held in aid of a new youth charity, The Queen's Commonwealth Trust.
She later joined Prince Charles on stage for the show's climax and was presented with a gift by a boy named Mason from west London, who was also celebrating his birthday.