Chris Brown Kisses Rihanna at the VMA'S..... What does his GIRLFRIEND have to say!!

So 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 . . .