Chris Brown's girlfriend Karrueche Tran is reportedly fuming over the kiss he shared with Rihanna.

After scooping up the coveted Video of the year prize at this week's MTV Video Music Awards (VMAs), Rihanna was seen making her way off stage and sharing an intimate moment with ex Chris.

The former couple - who have sparked speculation of a reconciliation of late - hugged and appeared to give each other a friendly kiss in the pictures which were taken as screenshots during a live feed of the show.

Karreuche is incensed about their exchange.

"[She is] totally pissed off," a source told Us Weekly.

"She felt the kiss was a public slap in the face."

Karreuche can't believe Chris shared that moment with Rihanna.

She would rather be kissing Chris at major events like this.

"[Karrueche] and Rihanna really hate one another and Chris ultimately just does what he wants," the source said.

"Seeing him with Rihanna at such a public event made her very angry."