That's a lot of leg you're flaunting, JB!

Justin Bieber dropped by the boxing gym for a sparring session today in LA, and we got quite the glimpse of his upper thighs as he got out of his ride. To be fair, his shorts weren't as short as they appeared at first, but we wish they were! You know who probably just got a peek at what's under there? Hailey Baldwin!

The "Sorry" crooner and the model were spotted getting a hotel room together in Beverly Hills on Wednesday. "Late last night [Justin Bieber] and Hailey ran through the lobby of the Montage and into an elevator together. They looked happy, giggly and were holding hands," a source dished to Hollywood Life.

Poor Selena Gomez literally just got out of rehab, and The Biebs being back in town is bound to send her right back to treatment. Hailey should look to the "Come & Get It" songstress as a cautionary tale, because Bieber Fever is always terminal!