Modern Family - Gay Choir Serenades Jesse Tyler Ferguson Onstage
The actors, who play a same-sex couple on the hit U.S. comedy, teamed up for a question-and-answer session for fans at the Wilbur Theatre in Boston, Massachusetts on Ferguson's 37th birthday.
Stonestreet decided to add some camp flair to the evening - he invited the Boston Gay Men's Chorus onstage to sing for his pal's big day.
The duo was wrapping up their show when the choir was unveiled from behind a curtain to sing Happy Birthday to Ferguson as he was presented with a birthday cake.
The blushing actor then picked up a microphone to join with the singers after they burst into a rendition of Katy Perry's hit Firework while Stonestreet danced along.