BETTER THAN A FUGGIN SOAP OPERA

(See C Brown's manager Tina Davis on the left and Chris's mom on the right)

TMZ knows who triggered the fight that left Rihanna battered and bruised and Chris Brown an accused felon -- it's Brown's manager.

Sources tell us the woman who left the three-page text message on Brown's cell phone is Tina Davis. Davis -- who turns 40 this month -- was rumored to have had a relationship with Brown when he was 16. Brown and Davis have denied it.

Law enforcement tells us the text message to Brown talked about hooking up later -- and it totally pissed off Rihanna. She slapped and hit him and he then brutally fired back.

The detective's affidavit refers to the text message as being "from a woman who Brown had a previous sexual relationship with."

Davis could not be reached for comment.

Poor Rihanna. SHe had no idea Chris and his manager created this fake relationship with her in order to keep thier relationship a secret. She should had been suspicious when he tried to talk to her on the heels of rumors around him seeing his manager. I guess when they tried to dump Rihanna, she wasn't having it. And is Tina pregnant?
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Check Tina out a few years back when she was A&R at DEF JAM (coincidently, rihanna's label)