VIDEO : Hailey Baldwin Lays Down the Law With Justin Bieber!

If Justin Bieber wants to date Hailey Baldwin then he has to be good! A source has revealed that Baldwin demands Bieber be monogamous and " said he would lose her if he didn't man up and show he was serious about her."

It was alleged that Justin had been hooking up with Kourtney Kardashian - something Hailey was not impressed about.
The source explained "Justin has never had a woman act like that before. He couldn't say no. So he's been seeing her again and is with her all the time."

The 19-year-old model was first romantically linked to the 21-year-old singer last year, with the pair confirming their romance during a New Year's holiday.