Zac Efron Joins the Entourage

Just when you thought Vince's Entourage couldn't get any bigger, High School Musical sensation Zac Efron will be making a cameo this season.

HBO confirmed to E! Online that Efron filmed scenes for the upcoming sixth season of the show at the Beverly Hills Niketown on Tuesday.

Season six premieres on July 12; Efron joins other celebrity guest stars that will play themselves, a list that includes Lil Wayne, Tom Brady, LeBron James, and Aaron Sorkin.