Showing he’s clearly done with high school, Zac Efron is graduating from Disney to HBO, as he signs on to make a cameo on Entourage in the upcoming season.


The channel confirmed the appearance to E! News, and he filmed scenes at the Beverly Hills Niketown store on Tuesday morning.


So will he be Adrian Grenier‘s new frenemy or what?

"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.

Season six of Entourage is slated to premiere on HBO July 12. 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.

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