Zac Efron Gets Robert De Niro's Thumb Up His Butt! Try Not To Be Too Jealous Of That Thumb When You See This Pic!

Lucky, lucky Robert De Niro!
If we could be that thumb, we certainly wouldn’t be complaining.
Because his thumb got the great experience of getting up close and personal with Zac Efron‘s butt on the set of their new movie, Dirty Grandpa.
The two were filming scenes earlier this week in Georgia, and for some reason that meant De Niro had to put his thumb up Zac’s butt!
[ Related: Zac Leaves Nothing To The Imagination In Nude Underwear! ]
Too bad Zac was fully clothed. LOLz!
Just based on the few pics we’ve seen from this movie, we’re totally seeing it when it’s released!
Almost naked Zac? Thumb up butt Zac? Just plain Zac?? Count us in!
[Image via Pacific Coast News Online.]