Rihanna at War with Chris Brown's Girlfriend

Rumor has it Rihanna and her ex, Chris Brown, have been secretly hooking up for months, but Brown's girlfriend Karrueche Tran isn't giving up her man without a good ol' social media fight.

Tran recently posted a message to her Facebook page likening herself to Angelina Jolie and Rihanna to Jennifer Aniston, the former Mrs. Brad Pitt: "I'm Angeline (sic), you're Jen. C'mon you see where Brad is at."

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Tran went on the defensive after Rihanna took several swipes at her, apparently mocking the wannabe model's Vietnamese heritage.

On the remix of "Birthday Cake," the singer offered up these words: "Sweeter than a rice cake/cake worth sipping." And on March 4, Rihanna tweeted a photo of a bag of rice cakes wearing sunglasses with large gold hoop earrings and the caption, "Ima make u my bitch."

In another tweet, Rihanna posted lyrics from Lil' Kim's song "Quiet Storm," ("I'm a leader, yall on some followin sh-t...comin in dis game on some modeling sh-t!") leading many to believe it was another dig, this time at Tran's professional aspirations.