Chris Brown Dumped by Girlfriend After Night of Partying with Rihanna and Nicole Scherzinger?

Down, girls! Chris Brown is reportedly back on the market.

The controversial crooner has allegedly been dumped by his model girlfriend after images romantically linking him to former Pussycat Dolls frontwoman Nicole Scherzinger and ex-girlfriend Rihanna surfaced on online blogs this week.

Brown’s live-in lover, Vietnamese model Karreuche Tran, has had it up to her well-groomed eyebrows with whispers about the R&B singer’s continuing relationship with Rihanna. Friends say Tran ended the romance after Breezy was reportedly spotted smooching the ex at New York hotspot Griffin on Monday night.

This, of course, comes less than a week after images of Brown reportedly snuggling up to singer Nicole Scherzinger in a crowded Los Angeles nightclub made headlines. The PR machine came out with guns blazing:

“There is absolutely no truth to this ridiculous story,” Nicole’s camp seethed. “The photos that have surfaced are of old friends who were trying to talk at a very loud club. They were not kissing. This is a non-story.”

It’s all too little, too late for Karreuche, a source tells Radar Online.

“Karreuche finally had enough and dumped Chris for good. Karreuche and Chris had been on thin ice for a while, but after he was spotted getting with Nicole Scherzinger in a Los Angeles nightclub recently and then when reports surfaced that he had hooked up with Rihanna – so she finally dumped him…She never went through his cellphone, but she suspected for a long time that he had been cheating on her for some time, she just never had the proof.”

The couple has been an item for more than a year, but Chris’ close relationship with Rihanna was a constant source of tension. Karrueche was reportedly upset that Rihanna’s male love interest in the controversial “We Found Love” music video bore a striking resemblance to Chris. She also wasn’t pleased by reports that Rihanna and Chris had rekindled a clandestine romance, three years after he savagely assaulted her on the morning of the 2009 Grammy Awards.

Tran nearly knuckled up with RiRi after the “Rude Boy” songstress got a little too close to her man during a party in Hollywood earlier this year. The Barbadian beauty and the aspiring catwalker reportedly had to be separated by security at the Greystone Manor after exchanging a barrage of fighting words.

“They are both young, but she just couldn’t tolerate being publicly humiliated anymore. The relationship was tumultuous and filled with drama and she just had enough, and wants a healthy relationship.”