(CBS) — Prince Harry and Meghan, Duchess of Sussex, attended a charity performance of the London production of the smash hit “Hamilton.” After the show, Harry got up on stage and even broke into song.

The show was part of a gala performance to raise funds for Sentebale, a charity created by Harry and Prince Seeiso of Lesotho. The charity is aimed at helping children and young people affected by HIV/AIDS in Lesotho and Botswana.

“Hamilton” creator Lin-Manuel Miranda tweeted a video from Kensington Palace of Harry singing and wrote “King George III’s great-great-great-great-great-great grandson The Duke Of Sussex sang a few bars tonight.” A few songs in the musical are sung by King George III, detailing his reaction to the American Revolution.

Harry and Meghan first saw “Hamilton” in London in February.