Zac Efron Joins HBO's Entourage Posted by DarkUFO at Tuesday, June 02, 2009 (View Comments) Labels: Entourage

High School Musical hottie Zac Efron is the latest big celeb to make a cameo on HBO's Hollywood-centric comed, Entourage.

HBO confirms to E! News exclusively that Zefron filmed scenes for the show's upcoming sixth season at the Beverly Hills Niketown store on Tuesday morning.

But what happened? Will he be tangling with Adrian Grenier's Vincent or is he Ari Gold's (Jeremy Piven) newest big "get"? Here's what we're hearing...

"He was filming a scene and talking on his cell phone," says one Niketown employee. "None of the other Entourage cast was here. He was really nice."

Efron was strictly business and did not snag any Nike gear for himself. An onlooker says he and the Entourage film crew arrived around 9 a.m., before the store opened, to shoot his scene.

"He was wearing sunglasses, and he left in a limo with another guy," says the eyewitness.

Season six of Entourage is slated to premiere on HBO July 12, at 10:30 p.m. Other anticipated celebrity guest stars appearing as themselves in season six include musician Lil Wayne, superstar athletes Tom Brady and LeBron James and TV auteur Aaron Sorkin.

Gary Cole, Autumn Reeser and Kate Mara are also slated to appear, playing a new group of agents (and assistants) who work with the boys.

Are you eagerly anticipating another round with the Entourage boys, or are you over their antics? Share your feelings in the comments!

Source: E!Online