Tue, 02 June 2009 23:15:49 ET

Zac Efron makes a guest appearance on "Entourage" for its upcoming sixth season. HBO has confirmed to E! News that the "High School Musical" hunk is the latest big celeb who makes a cameo on the Hollywood-centric comedy.
On Tuesday morning, June 2, Zac shot a scene for the show at Niketown in Beverly Hills. He arrived on the set with the crew at around 9 A.M. and shot his scene before the store opened. "He was filming a scene and talking on his cell phone," one of Niketown's employees said, before adding "He was really nice."
"He was wearing sunglasses, and he left in a limo with another guy," an observer informed. During the shooting, the Disney star was also seen striking poses with a young fan along with Jeremy Piven who plays Ari Gold.
The new season of "Entourage" will premiere on July 12. Other celebrity guest stars who are reported to play as themselves in season six are musician Lil Wayne, superstar athletes Tom Brady and LeBron James, and TV director Aaron Sorkin.
Posted by Staff Writer
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