Chris Pizzello / Invision/AP 1 / 15
Chris Pizzello / Invision/AP 1 / 15

Channing Tatum and Jonah Hill's co-star bond runs deep -- to the point where they're not shy about stripping down to their birthday suits in front of each other!

On Thursday's "Jimmy Kimmel Live," Tatum shared the time that he and Hill, 28, went for a late-night, X-rated dip while in Miami, where they were filming "21 Jump Street."

PHOTOS: Channing Tatum, Chris Evans, and more of Hollywood's buffest bods

"We decided to jump in the ocean -- naked. It was nighttime, thank God," Tatum told Kimmel.

The actor, 31, continued on about the crazy details of the night.

PHOTOS: Which star was Jonah Hill roommates with?

"There's Jerry's Deli right on the corner and [Jonah] decides he wants to go in and all he's got is his T-shirt and his underwear on and he's like, 'I'm going in to get something to eat!' and I'm like, 'No!' So I stopped him and [took] him back to the car."

"Now he's nicknamed 'Baby Jonah' because I had to dress him like a mom. I'm like, 'No, no. Bad Jonah. No. Butt up, butt up. OK."

PHOTOS: A look back at winter's hottest flicks

The indecent swimmers aren't the only 21 Jump Street stars that enjoyed themselves during the off-hours of filming.

"There were jars of moonshine, and everybody had their hands in them," their co-star Jake Johnson laughed to Us Weekly at the film's premiere in Hollywood Tuesday. "It was brutal!"

MORE ON WONDERWALL:

Hottest Remake Hunks

Channing Tatum: 'I know I'm not the best actor'

Out and About: Celebs on Vacation