I guess Chris Brown was mad when he heard he wasn't going to win a Grammy...

Chris Brown arrested in battery investigation, victim suspected to be girlfriend Rihanna

BY George Rush, Laura Schreffler and Oren Yaniv
DAILY NEWS STAFF WRITERS

R&B singer Chris Brown was arrested Sunday night by Los Angeles cops for allegedly beating up a woman, and insiders identified the victim as his superstar girlfriend Rihanna.

Sources said Brown beat sexy singer Rihanna, 20, after they fought in his car following a pre-Grammys party.

"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."

A security guard at Cedars-Sinai Medical Center in Los Angeles told the Daily News Sunday night that he saw Rihanna being taken for treatment at the hospital.

"She's been released," said guard Rodderick Brown.

The "Umbrella" singer and Chris Brown, 19, were both scheduled to perform at the Grammys, but pulled out at the last minute.

The Los Angeles Police Department would not identify the woman who was attacked, citing confidentiality.

The sweet-faced "Run It!" singer turned himself in wearing jeans at a Los Angeles police stationhouse about 7:15 p.m. local time.

He was polite, cooperated with cops and was released after paying $50,000 bail, police said.

Police said the fight took place about 12:30 a.m. Sunday in the affluent Hancock Park neighborhood.

"Brown and the woman were inside of a vehicle," 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.

Brown and Rihanna were seen Saturday night at a pre-Grammy gala hosted by music mogul Clive Davis in Beverly Hills.

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 at Clive Davis' party," said the industry insider.

"It seems she's taking the steps you'd need to take if you were going to press charges," added the source. "But she could wake up tomorrow morning and decide she still loves him."

The pop world's power couple have been dating for more than a year, and rumors have swirled that they were engaged.

Yet there were rumblings in recent days about troubles, and sources described the Barbados-born beauty as a clingy girlfriend who can't bear to have Brown out of her sights.

oyaniv@nydailynews.com