PIC: Shirtless Zac Efron Hangs With Ashley Tisdale at Beach Bash

 Albert Michael/startraksphoto.com

Cozy costars!

Former High School Musical stars Zac Efron and Ashley Tisdale reunited for a bit of fun in the sun at a Malibu, Calif., beach party Saturday.

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Frolicking in the water and on the sand outside The Talent Resources Malibu Beach House as he helped celebrate Tisdale's 26th birthday, Efron, 23, even gave his bikini-clad pal a piggyback ride. Later, the duo cooled off with Heineken Light and VnC cocktails.

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"So happy zacary made it to my party!!! He's my brother/best friend!!!" Tisdale Tweeted after the bash. "Had such a great birthday party yesterday! I'm so lucky to have such amazing friends, family, and man in my life!"

PHOTOS: See more pics of Zac and Ashley's fun in the sun at Popsugar

No, the man Tisdale was referring to in her Tweet wasn't Efron — she's been dating music video director Scott Speer since 2009.

PHOTOS: See an adorable pic of Tisdale and Speer

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"They are like brother and sister," a source tells Us Weekly of Efron and Tisdale. "They were just palling around, having fun. He would never think of her like that."

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