VIDEO: High School Musical Stars Assemble At East For Vanessa Hudgens 21st B-Day

Dec. 15 2009, Published 10:59 a.m. ET

We guess they really are all in this together: It looked like a East High School pep rally Monday, as High School Musical beauty Vanessa Hudgens celebrated turning 21 with her HSM co-stars at a birthday dinner at Hollywood's EAST restaurant.

Hudgens was snapped hand-in-hand with her gorgeous boyfriend Zac Efron. Other Disney channel divas present for the festivities were Selena Gomez and Ashley Tisdale.

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Hudgens co-stars with Neil Patrick Harris and Mary-Kate Olsen in Beastly, which hits theaters July 30, 2010.