ex girlfriend Selena Gomez laughed at Justin Bieber
 Rocker Musician Selena Gomez now laughs at ex-beau Justin Bieber's immature and  crazy behaviour. She also made fun of him when she heard of Bieber  threatening a photographer in London earlier this week.   "She doesn't care anymore. Bieber is crazy and she doesn't want to be his mom anymore. She                   feels so free and loves hanging out with her girlfriends. He is  weird and she doesn't find his behaviour hot or anything,"  femalefirst.co.uk quoted a source as saying.    "Gomez  wants to date someone who is mature and intelligent. Gomez is doing  really well and feels relaxed after dumping Bieber. She finds him to be  embarrassing since their breakup. He's turned into exactly the kind of  person she'd never want to be with," the source added.   MORE ON THE EX-COUPLE Selena Gomez is a sweetheart: Justin Bieber’s mum Don't  worry Beliebers, that's not a new girlfriend or crush. Justin Bieber is  only kissing his very very ...