The show's creator Lin-Manuel Miranda joined Harry onstage with the rest of the cast and seemed particularly enthused by his performance. As well as seeing the show, the trio met the cast and crew on the stage of London's Victoria Palace Theatre. He co-founded the charity with his friend, Prince Seeiso of Lesotho and shortly after the royal wedding, Prince Harry travelled solo to Lesotho to open a schoolhouse on behalf of the charity.
Meghan and Harry were both at the event, with the Prince taking part in the polo match.
On September 4, Harry and Meghan for an annual awards night for his charity WellChild.
Deputy Editor of Elle magazine Kenya Hunt believes it will take more than a few problems with her relatives to damage Meghan's brand.
The excitement turned to awe when Harry belted out a quick rendition of You'll Be Back, a number performed by the character of his ancestor King George III.
Yep, you're gonna be able to get up real, real close to Markle's silk dress, her five-metre-long silk tulle veil and even the tiara made from diamonds and platinum that she borrowed off Lizzie Babes.
The Duchess of Sussex showed off her svelte figure with a chic tuxedo dress however it broke the usual royal fashion rules of skirts and dresses below the knee.
Markle is a known for her love of dogs.
Miranda told the audience how he had written King George's role during his honeymoon, adding: "Smash cut to 2018 I'm sitting next to his sixth-great grandson".