Pics: Shirtless Zac Efron Frolicking With Ashley Tisdale at Malibu Beach

Celebrating Ashley's 26th birthday over the weekend, Zac is seen getting cozy with his former 'High School Musical' co-star as he gives her a piggyback ride at one point of the day.

Source: http://www.celebrity-mania.com/news/view/00020883.html

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