o it appears that Chris Brown's GF Karrueche is REALLY upset with the fact that Chris and Rihanna KISSED at the VMAS. Here's what US Weekly is reporting: A source tells Us that the aspiring model, 23, is "totally pissed off" with her beau of nearly a year after he congratulated Rihanna for her Video of the Year win with a very public show of affection. "She felt the kiss was a public slap in the face," the source says, adding that Brown decided to attend the VMAs last minute, without letting Tran know. . . . "[Karrueche] and Rihanna really hate one another and Chris ultimately just does what he wants," the source continues. "Seeing him with Rihanna at such a public event made her very angry." Well dang . . .