In short: A former lover of Brown's showed up at pre-Grammy Awards party at which Chris and Rihanna were in attendance.
The young couple fought over her presence at the gathering...
Friends since 2005, Chris Brown and Rihanna went public with their romantic relationship in 2008.
The couple went their separate ways after Brown pleaded guilty in June 2009 to assaulting the Barbadian singer on the eve of the 51st Grammy Awards.
I would wake up the next day feeling like s–t," she shared.