Her Opponent: Twitter user @NinyaBella
Why They Were Beefing: After Rih-Rih released the cover art for her single, "Man Down," one fan (who appears to be a young white lady in her Twitter avatar) took to her Twitter account to ask, not about the song, but about the way Rihanna's hair looked on the cover. "Why does her hair look so nappy?" she wondered. Later, Rihanna fired back: "Because I'm black bitch!!!!"
The Result: Hold up: Didn't we already tell you that Rih-Rih pays attention to what people say on Twitter? Watch what you say, people!