Fans weren't far off with their speculation of what caused Justin Bieber and Usher's recent confrontation... As we previously reported, the pop star and his former mentor have had a rocky relationship for some time now. Justin and Usher unfollowed each other amid all the Diddy allegations that were coming out. Usher also allegedly helped Diddy get "control" of the Canadian artist back in the day, per some wild claims from the time. And it all seemed to have come to a head at Beyoncé and JAY-Z's Oscars afterparty last week.