Zac Efron Got His Butt Violated By His 'Dirty Grandpa' Today!

Zac Efron goes shirtless with his pants on this time while filming scenes along the beach for his upcoming movie Dirty Grandpa on Tuesday (April 28) in Tybee Island, Ga.

The 27-year-old actor was seen earlier that day in just a pair of nude briefs while being chased around the set of the film.

Zac also filmed a scene that afternoon in which his on-screen grandfather Robert De Niro was seen sticking his thumb up the hot young actor’s butt. Eek!

Zoey Deutch was also seen on the set that day.