The Grey's Anatomy star has a good laugh during an outing in L.A. Plus: Lindsay Lohan, the Cheetah Girls and more

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CLASS ACTS

Ashley Tisdale, Zac Efron and Vanessa Hudgens celebrate the release of High School Musical 2: Extended Edition DVD premiere (benefiting Teen Impact Program at Childrens Hospital Los Angeles) in Hollywood on Monday. While the trio are on break, it looks like the cast will come back for HSM 3.

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