Chris Brown beats on Rihanna??

---->They were seen Saturday night at a pre-Grammy gala The two posed for pictures and were spotted kissing before they hopped into a waiting silver Lamborghini .
---->"They were arguing. Apparently, Rihanna accused him of checking out other women said the industry insider. "She got out of the car to walk home. He got out to stop her," said a source. "Things got physical. He hit her, possibly more than once. She had multiple bruises."
--->said LAPD spokeswoman April Harding "According to the victim they became involved in an argument. ... The argument escalated into an altercation."By the time cops responded to the scene following a 911 call, Brown was gone.
--->He(Chris) who turned him self in was polite, cooperated with cops and was released after paying $50,000 bail, police said.
*Both scheduled to perform at the Grammys, but pulled out at the last minute.