Zac Efron Goes Shirtless, Bares Hot Body in 'Dirty Grandpa' International Trailer

Zac Efron has shown us his hot body in lots of movies in the past, but it looks like he’s about to show us more than ever in Dirty Grandpa.

In the movie, which hits theaters on January 22, the 28-year-old actor plays a man who goes on a road trip with his grandpa (Robert De Niro) after his grandma dies.

PHOTOS: Check out the latest pics of Zac Efron

At the end of the trailer, Zac is seen with just a stuffed animal tied around his waist to keep himself modest. A child then rushes at him and grabs the doll, leaving him fully unclothed in public, though we know from the set photos that he was actually wearing skin colored underwear!

To watch the new trailer and see more photos, visit