Ashley Tisdale and Zac Efron Party at the Beach

'Best friends' pop singer Ashley Tisdale, and actor Zac Efron had a fun Saturday sunbathing and playing on the beach of Malibu in California. The High School Musical costars celebrate Tisdale's birthday beachside on Saturday. During her birthday party yesterday, Ashley Tisdale celebrated by getting a piggyback ride on the beach from a shirtless Zac Efron.