Rumor has it that Rihanna dumped Chris Brown and is back with her ex Matt Kemp. According to Hollywood Life, the two had dinner in L.A. on January 13th. Sources say that the two were spotted at a private dinner table.In other news, in an interview with Complex, Rihanna got defensive when she was asked about her relationship with Chris Brown. She said, "It's nobody's business." When asked if it's nobody's business, then why make a song about it, the singer responded, "Pardon me?" She then added, "It's the truth. It's a fun record that The-Dream wrote and we loved the lyrics. You're still asking me questions about it so clearly you don't know."