Zac Efron and Robert DeNiro Partake in Shirtless Flex-Off for ‘Dirty Grandpa’

Zac Efron Wears Crop Top
Zac Efron is looking seriously hot these days.

Lucky for us, there will be a ton of Zac Efron shirtlessness in the upcoming epic comedy Dirty Grandpa.

Efron and Robert De Niro were spotted on the set of Dirty Grandpa yesterday (Apr. 29, 2015) in Tybee Island, Georgia, where their characters were partaking in a flex-off contest.

This is the film’s synopsis:

The new comedy tells the story of an uptight guy who is tricked into driving his grandfather, a perverted former Army general, to Florida for spring break.

So far we’ve seen De Niro with his thumb up Efron’s butt, Efron wearing nude briefs holding a stuffed animal over his crotch and in another scene, he’s sporting a swastika on his head.

We can only imagine what situation Efron will find him in next?