Brown & Rihanna Argued Over Text?

TMZ is reporting that Saturday's incident between Chris Brown and Rihanna was over a text message Brown recieved after they left the party. "Law enforcement sources confirm to TMZ Chris Brown received a text message from a woman while he was driving with Rihanna and that's what started the confrontation that left Rihanna battered and bruised."

Apparently the woman wrote about hooking up with Brown later.