Dwayne "The Rock" Johnson has been busy filming his new "Baywatch" film -- yes, they're making a "Baywatch" movie -- and this week he got to work with "Baywatch" alum David Hasselhoff.

The Rock and Hasselhoff posed for this picture, which The Rock posted to his Instagram earlier today. The Rock captioned the image saying, "In the 80's he drove the coolest car on the planet. In the 90's he dominated slo-mo running on the beach with the most successful TV show of all time. And today he's simply Still the f'n man. Phenomenal day on set with my brotha - the OG himself @DavidHasselhoff - the man who started it all. Great dude with a great sense of humor. AND he trained his ass off for our movie."

In the 80's he drove the coolest car on the planet. In the 90's he dominated slo-mo running on the beach with the most successful TV show of all time. And today he's simply Still the f'n man. Phenomenal day on set with my brotha - the OG himself @DavidHasselhoff - the man who started it all. Great dude with a great sense of humor. AND he trained his ass off for our movie. #RockAndHoff #OnSet #RetroCool #AndSomeTattooedBaldMan #BAYWATCH MAY 2017.

A photo posted by therock (@therock) on

In the new "Baywatch" film, which hits theaters May 19, 2017, The Rock will be playing Hasslehoff's character from the TV series, Mitch Buchannon. Hasselhoff's role is still unknown, but it's likely he will have an extended cameo.

"Baywatch" stars Dwayne Johnson, Zac Efron, Priyanka Chopra, Alexandra Daddario, and Kelly Rohrbach.