The rumors of a beef between Chris Brown and Usher seem to be gaining more steam with this latest news. Usher and Chris Brown have abruptly canceled two major stadium dates, November 16th in L.A. and December 6th in Miami, amid rumors of behind-the-scenes drama. No official reason was given, but word is the two clashed during their November 5th Atlanta show. Chris reportedly wanted to hold the show so fans could get to their seats, while Usher insisted on starting on time. That led to major delays, a rushed set, and a fan petition with 3,000 signatures demanding refunds. For now, the rest of the tour is still on.