Justin Bieber: Partying with Jose Canseco's Daughter??? (VIDEO)

Sooo ... Justin Bieber left a Hollywood nightclub with a smokin' hot model Tuesday night -- and our sources tell us the mystery woman is Jose Canseco's daughter Josie.

Check out the video ... you can see Bieber getting into a waiting SUV after leaving 1 OAK on the Sunset Strip -- and then a few moments later, a blonde (who we're told is Josie) gets in the car.

The two have reportedly known each other for a while -- but it might not be what you think ... since Josie is dating rapper Mike Stud.

We reached out to Josie for the 411 -- stay tuned.