Dwayne Johnson Admires Zac Efron's Buff Bod: 'Nice Tits Brother'

Zac Efron gets the ultimate praise from Dwayne Johnson.

Even the super fit Dwayne Johnson has a healthy admiration for Zac Efron's chiseled physique.

After Efron Instagrammed a screen shot of his new movie with Robert De Niro, Dirty Grandpa -- in which he dons an orange crop top reading, "Stop staring at my tits" -- Johnson just couldn't resist.

"Nice tits brother. See you soon!" Johnson commented, also hilariously using the emojis of crying with laughter, 100, and a fist bump.

WATCH: Zac Efron's Shirtless 8-Pack Is on Full Display as He Shamelessly Adjusts His Package on 'Neighbors 2' Set

Johnson, 43, and Efron, 28, are co-starring together in a reboot of Baywatch, and from the looks of it, the two are already getting along just fine.

Efron has more than one celebrity admirer though, as he's been showing off his super fit bod on screen more than ever lately. In April, he went nearly naked in nothing but a pair of nude undies on the set of Dirty Grandpa, and in September, he shamelessly adjusted his package and flaunted his eight-pack abs in a pair of orange booty shorts on the set of Neighbors 2.

"That kid is a winner," his Neighbors 2 co-star Seth Rogen told Ellen DeGeneres last month. "He's even more handsome this time around. I don't know how that happened. It's something he eats. It's crazy. He gets better and better looking. He's aging like a fine wine."

"And I have to be shirtless next to him, and it's horrible -- just horrible," the comedian added. "It's your worst nightmare."

In his latest Instagram, Efron admits he spent most of his time with the legendary De Niro "naked or in women's clothing."

"It's been a life-long dream of mine to work with De Niro," he shared. "Lo and behold, I spend most of the movie naked or in women's clothing. And you know what...it was TOTALLY WORTH IT."

WATCH: 11 Reasons Zac Efron and Dwayne Johnson Are PERFECT for the 'Baywatch' Reboot

Watch the video below to see the former High School Musical star going nearly naked on the set of Dirty Grandpa!