Justin bieber Just Got Back To US And Is Already In Trouble

Justin Bieber just got back to the U.S.A. and he's already got police pounding on his front door -- for throwing one of his trademark Beverly Hills all-nighters.According to law enforcement sources ... Bev Hills P.D. went to Bieber's condo Twice last night to deal with noise complaints. The first visit was shortly after 11 P.M. ... but when officers arrived they didn't hear anything, so they left without knocking.The second time -- around 12:40 A. »