Zac Efron & Backless Vanessa Hudgens Cuddle At 'Charlie St. Cloud' Premiere (PHOTOS)

Zac Efron held on tight to girlfriend Vanessa Hudgens at the premiere of his new film 'Charlie St. Cloud' in LA Tuesday night. The pair, who have dated since they costarred in the 'High School Musical' trilogy, snuggled for the cameras while Hudgens showed off her bare-backed dress.

Efron has transitioned to big-screen leading man in multiple roles since his Disney TV days, while Hudgens has had less movie success.

'Charlie St. Cloud' opens July 30. Scroll below the photos to watch the trailer.