Talk about an unlikely duo!

After sweating it out at the dance studio earlier in the day, Justin Bieber stopped by the Montage in Beverly Hills to soak up the sun at the pool on Friday afternoon. At first we thought it was a coincidence that we caught Scott Disick leaving the hotel a few hours later, but after the Biebs posted a photo on Instagram of himself playing with Scott's son Mason, it was clearly a planned get together!

Justin is super close with Kendall and Kylie Jenner and he's hung out with Scott before, but seeing as the reality star is fresh from rehab, is hanging out with a smokin' hot 21-year-old party-loving playboy the best idea? Probably not, but Bieber does seem to be having a blast baby sitting, so that has to count for something!

And speaking of shirtless poolside snaps, Bieber's pretty female friend seemed all too happy to pose for the photo below: