Stars Swarm 17 Again Premiere

Zac Efron heats up GQ this month.

Vanessa Hudgens looks sexy in SELF.

But the two sides of Zanessa never look better than when spotted together, which took place earlier this week at the Hollywood premiere for 17 Again. It's Efron first, post-High School Musical starring role.

Not that Zac even had time for Vanessa, unfortunately. He had to satisfy the contingent of crazed fans that showed up on the red carpet. He appears to be making one girl's life by signing an autograph for her here...

Efron and Hudgens weren't the only young stars to show up for the event. They were joined by friend Corbin Bleu, Brittany Snow, The Jonas Brothers and even this season's American Idol finalists.

Click on each photo below for a larger view of various celebs...