Zac Efron

As details about Zac Efron's substance abuse problem slowly leaked, fingers began pointing in a rather unsurprising direction: Charlie Sheen. But he swears he's innocent.

It shocked the world when it was revealed that clean cut star Zac Efron completed rehab for alcohol and cocaine addictions, but what's more shocking is that he actually went to rehab twice ... and it was bad.

Although Nick Jonas and Zac Efron used to be tween idols, both stars have matured into adult careers. No worries, both men have retained their heartthrob status! Which singer/actor is more swoon-worthy?

'High School Musical' star Zac Efron hasn't been seen much in recent months, but everyone assumed he was just working on his film career. And he was -- with a layover in rehab earlier this year. And the problem was apparently pretty severe.

Even though Kristen Stewart was rumored to be back together with longtime rollercoaster love Robert Pattinson, a brand new name has entered the romantic mix from left field: Zac Efron. Is 'Twilight' mixing with 'Hairspray?'

Zac Efron may be right, but he should keep these things to himself. We don't want Michael Bay getting any ideas about musical/disaster mashups.

Zac Efron has a pretty public sex life, almost entirely by accident. After dropping a condom on the red carpet at the premiere of 'The Lorax,' the former 'High School Musical' star is in another photographic gaffe, this time with a bunch of dildos. But it's not what you think. No, really.