Duke and Duchess of Sussex
The Duke and Duchess of Sussex are pictured arriving for a gala performance of the musical HAMILTON in support of Sentebale at the Victoria Palace Theatre, London, Britain August 29, 2018. Dan Charity/Pool via Reuters

Prince Harry delighted the cast and audience of the Broadway musical “Hamilton” on Wednesday night when he suddenly broke out into song. The Duke of Sussex and his Duchess, Meghan Markle, attended a gala performance of the popular musical at London’s Victoria Palace Theatre.

The couple attended the event to support Sentebale, the charity helping children affected by HIV in Botswana and Lesotho. They were seen chatting with star and creator Lin-Manuel Miranda before the show.

It was after the performance that Harry teased the audience as he took the stage to thank everyone for contributing to the organisation, of which he is a patron.

“You say…” the Duke started to sing, to the delight of the cast behind him and the audience. He was unfortunately just joking, stopping just after two words in.

Apart from Harry’s much too brief musical career, Meghan also made social media headlines with her appropriate but unusual choice of outfit. The Duchess wore a black tuxedo dress by Canadian label Judith and Charles. The length of the skirt was what had her fans cheering for as it was said to be against the royal dress code.

Apparently, the royal family aren’t meant to wear dresses and skirts above the knees, and Meghan’s dress that night was several inches so. It was a revealing sartorial choice by royal standards, but according to reports, it was still deemed appropriate because she wasn’t attending an official royal event.

Speaking of dresses, Meghan’s complete wedding outfit will be featured in the exhibit “A Royal Wedding: The Duke and Duchess of Sussex” from Oct. 26 to Jan. 6 at Windsor Castle. Her wedding outfit includes the dress created by British designer Clare Waight Keller, as well as the diamond and platinum bandeau tiara loaned to her by Queen Elizabeth.

A copy of the frockcoat uniform Harry wore to the May wedding will also be featured. Only the copy will be displayed as the Duke still uses his actual uniform.