Caught in the Act

Zac Efron Amuses Himself at a Burlesque Show in L.A.

11/08/2011 at 05:55 AM EST

Zac Efron was having a ball and laughing at everyone dressed in their funny costumes during a Beacher's Madhouse performance inside the Hollywood Roosevelt Hotel. The actor gave a high-five to Big Bird, and laughed and joked along with a guy friend seated next to him. Efron mostly kicked back, relaxed and watched the show, though. Says an onlooker: he was "amused by all the acts." – Jennifer Garcia

NEXT: David Beckham Takes In a Jazz Concert >