Robert De Niro, Zac Efron

Bruja, PacificCoastNews

Yes, you read that correctly.

For their new movie Dirty GrandpaRobert De Niro and Zac Efron got to share a very special moment that they'll probably never forget. As seen in photos taken of the two on the set in Tybee Island, Georgia on Tuesday, the 71-year-old Goodfellas star appears to stick his thumb up the 27-year-old hottie's butt, which is covered by a pair of mustard pants. He's multitasking too—the elder star holds a cellphone up to his ear.

Efron's behind appears to be play a prominent role in the comedy film. The actor was seen sporting nothing but a pair of light nude undies while filming a scene on the beach (see the NSFW photos). He also wears a cropped, fringed top in another.

Robert De Niro, Zac Efron

Bruja, PacificCoastNews

Dirty Grandpa is set for release in 2016 and sees De Niro playing Dick Kelly, a perverted former Army general who gets his grandson Jason, played by Efron, to drive him to Florida. The comedy also stars Dancing With the Stars co-judge and actress Julianne HoughAubrey PlazaDermot MulroneyZoey Deutch and Happy Endings alum Adam Pally.

The director is Dan Mazer, who previously helmed episodes of Sacha Baron Cohen's hit comedy series Da Ali G Show, in which he also served as a writer. Mazer also penned the screenplay for Baron Cohen's alter ego comedy movies Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan and Brüno

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