December 7th, 2010
04:47 PM ET
It was a "Teenage Dream" come true for fans of both Katy Perry and "Glee" at the December 5 Trevor Project Live event at the Palladium in Hollywood.
Accompanied by the Fox show's Dalton Academy Warblers, actor Darren Criss, who plays openly gay student Blaine, performed Perry's "Teenage Dream" – the same song he performed on "Glee" and took to the top of the Billboard charts. Toward the end of the tune, Perry - who included the single on her "Teenage Dream" album this year – joined Criss on stage to sing a few lyrics from her hit.
But Perry, 26, and Criss weren't the only ones who did a duet at the event hosted by the Trevor Project, a suicide prevention hotline for gay youth.
E! Online reports that actors Neil Patrick Harris and James Marsden, both 37, teamed up for "An Old Fashioned Wedding" from the musical "Annie Get Your Gun" - and even shared an on-stage smooch.
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