The sixth season of HBO’s Entourage has a secret weapon: High School Musical heartthrob Zac Efron. Efron was spotted at a Nike store in Bevery Hills Tuesday morning shooting a scene without the rest of the cast. (A witness says the scene mainly involved Efron talking on his cell phone—how apropos for the show.) Musician Lil Wayne and athletes Tom Brady and LeBron James are also expected to make cameos this season, which debuts June 12. If headliner Adrian Grenier is looking for a way out, perhaps Efron will be happy to slide into his role?