Teen Angst with Zac Efron

8/27/2007 1:28 PM PDT
Maybe it's the hot weather, maybe it's the swarm of photogs -- or it could be his crappy car, but when he was asked to smile, Zac Efron said, "I'm not happy."

At least that's what the pumping star told paps when they asked for a smile. It didn't help the "High School Musical" teen idol when they told him he was SO cute!

Zac eventually cracked a smile while leaning on his hoopty. With two hit movies and a reported multi-million dollar offer for a third installment of "High School Musical," -- Zac has a lot to be happy about.