Big news going on during the Grammys – both Rihanna and Chris Brown have canceled their Grammy performances following an investigation of Chris Brown’s alleged assault on a female.

According to People.com, around 12:30 a.m. today, Brown got into an argument with a woman in a vehicle in L.A. Brown stopped the car, the argument got more heated and apparently the woman suffered visible injuries. She identified Chris Brown as the attacker.

The Recording Academy announced that Rihanna will not attend/perform at the Grammys, nor will Chris Brown perform at the event as he was originally scheduled to do.

UPDATE: Well, it’ll be interesting to see how this all shakes out. TMZ reports that Chris Brown turned himself in to the LA police in connection with this alleged domestic violence assault. It was Rihanna who was in the car with Chris Brown – the couple got into an argument that resulted in injuries to Rihanna.