Zac Efron to Guest Star on 'Entourage'

Zac Efron cuddles with a cute toddler and Entourage star Jeremy Piven on the set of the HBO series in Los Angeles on Tuesday morning (June 2).

The 21-year-old actor is set to guest star on the hit comedy Entourage. E! News reports, “Zac Efron is the latest celeb to join the Entourage boys on HBO. Apparently Zac shot a scene this morning at Niketown in Bev Hills. SWEET!”

One Twitterer shared yesterday night, “Just overheard “will Zac Efron be needing hair and makeup?” Throughly confused, embarassingly excited…”

Entourage stars Adrian Grenier as movie star Vince Chase who navigates the vapid terrain of Los Angeles with a close circle of friends and his trusty agent.

TELL JJJ: Are you excited to see Zac on Entourage?

10+ pics inside…