Zac Efron Goes Shirtless, Flashes Abs on Townies Set: Picture

Zach Effron plays basketball shirtless on the set of the Townies on May 7, 2013. BAUER-GRIFFIN.COM

Shirts vs. skins? Zac Efron unbuttoned his dress shirt and flashed his beautiful abs while playing basketball on the L.A. set of Townies Tuesday, May 7.

The hunky actor, 25, showed off his skills — and incredible six-pack — while filming in an open blue dress shirt and gray sweatpants that he pulled down to expose his boxer briefs underneath.

PHOTOS: Shirtless hunks!

In the upcoming comedy, Efron plays a frat boy who disrupts the family life of his neighbors (Seth Rogen and Rose Byrne). Rogen, 31, shared with Us Weekly at the Hilarity for Charity event on Apr. 25 that Efron really is as good looking in person as he appears on film.

"Zac Efron is incredibly handsome," Rogen admitted. "He's the sexiest motherf—er on the planet. He's a good-looking kid."

"I did a scene next to him, and we're both shirtless, and it was a very humbling experience," he added. "I marveled that we're literally the same species. He's very veiny. I'm not that veiny . . . and I'm hairier than he is."

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