Joe Jonas and Demi Lovato showed why it pays to stay all the way to the end of a movie, popping on stage Wednesday after the "Camp Rock 2: The Final Jam" premiere in New York to sing the duet "Wouldn't Change a Thing" from the movie's soundtrack.
Much audience shrieking ensued, according to People, which deemed the surprise performance a hit.
Kevin and Nick Jonas, little brother Frankie Jonas and "Camp" costar Alyson Stoner were among those hitting the red carpet outside Alice Tully Hall in New York's Lincoln Center for the premiere. "Camp Rock 2" airs Sept. 3 on Disney Channel.
-- Christie D'Zurilla
Photos: Minnie and Mickey Mouse smooch Demi Lovato on the "Camp Rock 2: The Final Jam" premiere red carpet Wednesday in New York City. Kevin Jonas, left, Nick Jonas and Joe Jonas pose with 9-year-old brother Frankie Jonas, front. Credits: Jemal Countess / Getty Images
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Demi Lovato hearts Kelly Clarkson, and Bill O'Reilly hearts Demi Lovato
Boy band roundup: Backstreet Boys switch labels; Nick Jonas to make West End debut
The Jonas Brothers, elder statesmen of Kids' Choice Awards [video]
Kevin Jonas marries Danielle Deleasa, winter wonderland style!
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