Zac Efron Joins 'Entourage' -- FIRST PICS

Zac Efron poses with a young fan after filming a guest spot for HBO’s hit show Entourage on Tuesday morning (June 2).

E! reports, “Zac Efron is the latest celeb to join the Entourage boys on HBO. Apparently Zac shot a scene this morning at Niketown in Beverly Hills. SWEET!”

The NY Times reports the shoot took place inside the Grand Trianon meeting room at the Beverly Wilshire, a luxury hotel at Wilshire Blvd. and Rodeo Drive.

The boys are back with a new season of Entourage @ 10:30PM ET/PT on Sunday, July 12.

10+ pictures inside of Zac Efron on the set of Entourage…