Zac Efron Wears Tight Blue Tee On 'We Are Your Friends' Set

Zac Efron shows off his muscles in a tight blue tee as he arrives on the set of We Are Your Friends on Friday afternoon (September 5) in Burbank, Calif.

In case you missed it, the first look footage of the film was released earlier this week and also stars Jonny Weston and Shiloh Fernandez.

PHOTOS: Check out the latest pics of Zac Efron

It was also just announced that Zac will star alongside Robert De Niro in Dirty Grandpa.

He’ll play a young man who is tricked into driving his grandfather (De Niro), a perverted former Army general who thinks his grandson is about to marry the wrong woman, to Florida for spring break.

10+ pics inside of Zac Efron…