CHRIS BROWN/ RIHANNA DETAILS

HERE'S WHAT PROSECUTORS SAY CHRIS BROWN DID TO RIHANNA: (PLEASE NOTE: THIS IS A VERY DETAILED REPORT! READ AT YOUR OWN RISK!)

Prosecutors finally released THEIR account yesterday of what happened between CHRIS BROWN and RIHANNA on the morning of February 8th. And it's pretty gruesome. (--Seriously . . . if you're sensitive to stories of domestic abuse, some of this might be hard for you to hear . . .)

It all started in Chris' rented Lamborghini, on the way home from the pre-Grammy party Chris and Rihanna had been at. Rihanna picked up Chris' phone and discovered a THREE-PAGE text message from a woman he'd had a previous sexual relationship with. An argument ensued, during which Chris stopped the car and attempted to push Rihanna out. It didn't work because she was wearing her seatbelt. So instead, he shoved her face into the window, causing, a, quote, "one-inch raised circular contusion."

Then he took off again, punching Rihanna numerous times WHILE HE DROVE. Rihanna's mouth began bleeding profusely . . . and the blood got all over her dress and the car's interior. --He also told her, quote, "I'm going to beat the (crap) out of you when we get home. You wait and see." --Rihanna then picked up her phone and attempted to call her personal assistant. The assistant didn't answer, but Rihanna PRETENDED to be talking to her. She said, quote, "I'm on my way home. Make sure the cops are there when I get there." --Chris responded by saying, quote, "You just did the stupidest thing ever. Now I'm really going to kill you."

Then he CONTINUED punching Rihanna while driving . . . with Rihanna trying to cover herself up the whole time. She tried to text another one of her assistants, but Chris grabbed her phone and threw it out the window. --So Rihanna tried to grab Chris' phone . . . but he put her in a headlock . . . and bit her left ear.

Chris then stopped the vehicle, and Rihanna grabbed the keys from the ignition and sat on them. Not knowing what she'd done with the keys, Chris started choking her out to the point where she was losing consciousness. Rihanna gouged at Chris' eyes to get him to let go. He did . . . but not before biting her fingers. --Chris then went back to punching Rihanna . . . hitting her all over her body as she curled up and tried to protect herself. Then she began screaming . . . and that's when Chris got out of the car and walked away.

(--That's a pretty full account of what prosecutors and police say happened that night . . . but if you'd like to read the document for yourself, you'll find it here . . . http://www.thesmokinggun.com/archive/years/2009/0305093brown1.html)

--One additional note: Law enforcement sources tell TMZ that when police interviewed Rihanna right after the attack, she told them that Chris had been violent with her in the past . . . and that his attacks were getting progressively WORSE.