Prince Harry Sings 'So Long, Farewell' From 'Sound of Music' During Royal Event: Watch

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Prince Harry, Duke of Sussex arrives for the Veterans' Mental Health Conference at King's College on March 14, 2019 in London.

Prince Harry and Meghan Markle stopped by the Commonwealth Day Youth Event at Canada House in London earlier in the week, where the Duke of Sussex treated the kids to a brief musical moment.    

The event was held for the couple to meet young Canadians from fashion, the arts, business and academia to hear about their experiences as expats and about opportunities for young people working in the Commonwealth.‚Äč While the royal parents-to-be were leaving the event, Harry waved goodbye to the crowd, and sang a short snippet of "So Long, Farewell" from The Sound of Music. 

Watch the clip below, as the Duchess smiles at her husband's adorable moment.