De Niro plays a perverted former army general who tricks his grandson into going to Spring Break with him in Florida.
Julianne Hough plays Efron’s fiance in the film, which also stars Zoey Deutch, Aubrey Plaza and Dermot Mulroney.
Dirty Grandpa hits theaters next August (2016).
See more pics of shirtless Zac on the following pages!
Photo Credits: © Bruja/Thibault, PacificCoastNews; © Thibault Monnier/Bruja, PacificCoastNews ,
Source: Starpulse Celebrity News