Meghan took things up a notch as she donned a daring yet stunning Judith and Charles black tuxedo mini-dress, breaking the royal protocol of wearing dresses below the knees, for the event.
Hip hop musical Hamilton tells the story of Alexander Hamilton, one of the Founding Fathers of the United States.
It's believed that Meghan, Prince Harry, Prince William, Princess Anne and the Countess of Wessex are among those who have been interviewed.
'I wrote the song on my honeymoon and smash, cut to 2018 and I am sitting next to his sixth great-grandson, the Duke of Sussex'.
She's the queen of style and grace in our books, but could Meghan Markle (aka the Duchess of Sussex) ever actually be the queen? "You say." he sang, before cutting himself off - though the cast behind him were clearly delighted, jumping and clapping.
She was pictured trying her best to hide her excitement, but could be seen, a video showed, bursting into laughter and clapping her hands as Prince Harry began his speech by briefly singing "You'll Be Back". "Ladies and gentlemen, the Duke of Sussex". Miranda reportedly replied, "I'm sorry you've got to watch it again".
It was so engaging, every moment of it.
Lin-Manuel Miranda, the creator of Hamilton, was so impressed by the brief performance he stomped his foot.
Harry said: "That was absolutely incredible".
The concert was held to raise money for Sentebale, the charity that Prince Harry co-founded with Prince Seesio of Lesotho that works to support kids with HIV, AIDS and children with high needs in Lesotho and Botswana.