Photos: Zac Effron All Naked With His Butt In The Open.....

Actor Zac Effron showing off his butt in a nude underwear on a movie set? Well the actor who's shooting 'Dirty Grandpa' was supposed to ride a motorcycle butt naked but he became camera shy and declined.

He said he wouldn't do it. He said "my butt isn't for your viewing pleasure".
So they brought in a butt-double to step in for him.So when you see the movie and you see that scene, know it isn't Zac's butt.

Follow Me On Twitter & Instagram: @effiongeton