Reports are circulating the web that moments prior to being brutally attacked, singer Rihanna flipped out on boyfriend Chris Brown when she found a text message from an ex-girlfriend on his phone.

The NY Daily News, citing a music industry source, reports that the 20-year-old songstress and Brown were fighting over the text message while the couple were driving nearby her Hollywood Hills home. Rihanna attempted to get out of the car when the fight escalated.

He got a booty call. He got a text. Rihanna saw it and she got upset. They started to argue. She got out of the car. He wanted her to get back in, so he grabbed her, the industry source tells NY Daily News. She pulled away. Thats when shes told people he hit her.

According to an E! Online exclusive report, the Umbrella singer grabbed the keys from the ignition and threw them out onto the street, sending Brown into a rage.

After failing to find the keys, Brown came back to the car, put his hands around Rihannas neck and, according to the E! report, said, Im going to kill you!

The NY Daily News source scoffed at reports that the fight erupted after a jealous Brown scolded Rihanna for spending time with producer Timbaland at a pre-Grammy party.

The inside source says, Chris has been trying to contact her. So far she hasnt taken his call. Her family is on their way to be with her. She has some close girlfriend looking after her.

OK! magazine is suggesting that the feud started on Feb. 5th when heiress Paris Hilton and Brown were being flirty at the Verizon & BlackBerry Storm Grammy party at Boulevard 3, while Rihanna performed.

He and Paris went outside together, a witness tells OK!. Back inside, they got closer. Paris was all over him, the partygoer says. Rihanna caught wind of it and spent the rest of the night glued to him.

Brown has been charged with one count of making felony criminal threats. The singer posted a $50,000 bond and was released by police Sunday night. A March 5 court date has been set.

Sowhat side do you believe?