Zac Efron Shows Off His Bulging Biceps on 'Neighbors 2' Set

Zac Efron wears a tight fraternity tee while carrying a bag on set of his movie Neighbors 2: Sorority Rising on Thursday (September 10) in Atlanta, Ga.

The 27-year-old actor was joined that day for filming by his co-stars Seth Rogen and Rose Byrne.

PHOTOS: Check out the latest pics of Zac Efron

The day before, Rose was spotted wearing rain boots on set of the film, which also stars Chloe Moretz, Dave Franco, Selena Gomez, and more.

35+ pictures inside of Zac Efron, Seth Rogen, and Rose Byrne on the Neighbors 2 set…