Justin Bieber Reportedly Hooking Up With Reality Star

Justin Bieber seems to have a different girl on his arm every day!

First he's instagramming throwbacks of him and ex Selena Gomez, which has our hearts like 'awwww!'. Then he's instagramming a picture of some random girl he's trying to find, like a real-life On The Line, which has us all like, 'oh my gosh, what if Bieber randomly comes across my picture, posts it, we fall in love and live happily ever after?!'

**If you don't know what On The Line is... it's a classic tale of boy sees girl on the train, boy never asks girl for number, boy spends rest of his lonely life trying to find the train girl until they're magically reunited by his masterful, yet-corny, poster ads all over Chicago. Featured *NSYNC bandmate Lance Bass along with music from the best boy band of all time and Britney Spears.**

Then the Biebs, 21, yanks our hearts in a completely new direction when we hear that he's been bragging to friends about hooking up with 36-year-old mother of three Kourtney Kardashian.

WHAT?!

YEAH.

He's even rumored to be taking a shot at Kourtney's baby daddy, Scott Disick, in the below instagram that's captioned "Lord Knows."