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Dwayne "The Rock" Johnson said what we are all thinking.

Zac Efron shared a still from his film Dirty Grandpa on Instagram to share a thoughtful and sweet message about his co-star Robert DeNiro. "It's been a life long dream of mine to work with De Niro," he wrote. "Lo and behold, I spend most of the movie naked or in women's clothing. And you know what...it was TOTALLY WORTH IT. I can't wait for you to see @dirtygrandpa - it's hilarious! Save the date for a wild (and really weird) ride on JAN 22 #dirtygrandpa."

The photo shows Efron's attention-grabbing abs in a tiny and tight tank that says, "Stop Staring at My Tits." And you know who could help but stare (and comment) at Zac's hooters? The Rock.

Zac Efron, The Rock, Instagram

Instagram

"Nice tits brother. See you soon!," the pro wrestler and actor hilariously commented on the photo.

As Efron's caption already explains, there are some serious reasons to catch this flick on the big screen (please refer to the part where he says he's naked for most of it). Along with that, we know his character does the macarena with nothing but a stuffed animal covering his privates while he's high on crack cocaine.

The movie follows foulmouthed Grandpa Dick (De Niro) and his straight-laced grandson Jason (Efron) during their road trip from Atlanta to a retirement community in Boca Raton, Fla.

Jason's last-minute trip doesn't sit well with his controlling fiancée (Julianne Hough), who can't believe that he would leave her to finalize wedding plans just days before their nuptials. Meanwhile, Dick does everything he can to get Jason to loosen up, and as we can already conclude, it worked.

Dirty Grandpa hits the big screen Jan. 22.