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Leaving High School behind, Zac Efron is moving to more mature roles, as he has just snagged a guest cameo on HBO's Entourage.

Zac shot a scene for the show in Beverly Hills on Tuesday, where he was greeted warmly by Jeremy "Let's hug it out" Piven. Both Zac and Jeremy posed with fans on the set, before getting to work. No other details about Zac's part were given, except for the fact that his episode will air next season.

From Disney to HBO -- Zac is certainly growing up.