Rihanna and Chris Brown’s Girlfriend Karrueche Tran at War!

 RAMEY PHOTO; Jon Furniss/WireImage.com

Rihanna may have a remix with her ex-boyfriend Chris Brown, and as far as his current girlfriend Karrueche Tran is concerned, that's about where their relationship ends!

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The aspiring model who's been hot and heavy with Brown since January, lashed out at the "We Found Love" singer on her Facebook page.

"I'm Angeline [sic], you're Jen. C'mon you see where Brad is at," Tran, 23, posted to her profile, referencing the famous Angelina Jolie/Brad Pitt/Jennifer Aniston love triangle.

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The cyber attack came after Rihanna, 24, tweeted a photo that could be interpreted as a racist jab at Tran, who is half-Vietnamese: a bag of rice cakes with gold earrings and black shades, along with the caption, "Ima make u my bitch," on March 3.

On Tuesday, Rihanna, perhaps fueling the feud again, tweeting lyrics from Lil Kim/Mob Deep's remix "Quiet Storm," "I'm a leader, yall on some followin s***…comin in dis game on some modeling s***!" possibly referencing Tran's occupation.

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In January, sources close to the exes told Us Weekly that the pair have been secretly hooking up for nearly a year.

"Rihanna loves to live dangerously, and talking to and hooking up with Chris is all part of that," adds a Rihanna insider.

Meanwhile, Brown's rep tells Us, "He and Rihanna are just friends. He's not cheating."

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