Rihanna Cancels Grammy Performance; Chris Brown Sought By Police

In what may or may not be related news, ET confirms that pop singer Rihanna will not be performing at tonight's Grammys following sustaining a bruised face in what sources called a car accident.

Coincidentally, Rihanna's rumored boyfriend Chris Brown is under investigation for alleged domestic violence felony battery related to an alleged attack on a woman in a car who sustained what police call "visible injuries."

Sources at the Grammys tell ET that Rihanna's face is slightly bruised and no announcement has been made as to who will be taking her place on stage. "We have just been informed that Rihanna will not be attending tonight's 51st Annual Grammy Awards. We're sorry she is unable to join us this evening," The Recording Academy's statement reads.

Related to the Brown investigation, police say Brown and the woman were in a vehicle in the Hancock Park area of Los Angeles when, following an argument, the woman was allegedly injured, naming Brown as her attacker. When police arrived, they only found the woman; Brown had left. The Associated Press reported Sunday afternoon that police were still looking for the male R&B star.

Police say they received a 911 call related to the incident which occurred around 12:30 a.m. on Sunday. The LAPD is investigating the incident.

Rihanna and Brown were just photographed together at a Pre-Grammy party on Saturday night. (source: Entertainment Tonight)