Zac Efron's Shirtless Body Is Insane in First 'Dirty Grandpa' Trailer - Watch Now!

Zac Efron has never looked hotter while flexing his insane shirtless body in the first trailer for his upcoming film Dirty Grandpa!

The trailer – which was debuted by BuzzFeed on their Facebook page – also features shirtless Robert de Niro, Julianne Hough, Zoey Deutch, Aubrey Plaza, and many more.

Here’s a synopsis: Right before his wedding, an uptight guy is tricked into driving his grandfather, a perverted former Army general, to Florida for spring break.

The movie is set to be released on January 22, 2016! Watch the trailer below…