Victim: Ciara
Date: February 26, 2011

The ongoing feud between Ciara and Rihanna started back in 2011 when CiCi hopped on E!'s Fashion Police with Joan Rivers. "I ran into [Rihanna] recently at a party. She wasn't the nicest," Ciara told Rivers. "It's crazy, because I've always loved and respected what she's done in fashion. It wasn't the most pleasant run-in." It turned into a back and forth with Rihanna insinuating she should have tipped Ciara. Which spawned this: