Rihanna vs. Karrueche Tran - Chris Brown's ex-girlfriends have been going at it all year, with Rihanna throwing gasoline on the flames. When the mega pop star tweeted, "Ima make u my b----" with a photo of a bag of rice cakes wearing sunglasses and door knocker earrings, Karrueche, who's half-Vietnamese, knew what time it was. Tran tweeted back, "I'm Angeline [sic], you're Jen. C'mon you see where Brad is at." However, Brown eventually ended his relationship with Tran and revealed he loved both women. (Photos from left: Rob Kim/Getty Images, FayesVision/WENN.com)