Update: Chris Brown & Rihanna Grammy Weekend Drama

Sunday night, R&B's hottest couple, Chris Brown and Rihanna, were supposed to light up the Grammys.

Instead, the normally affectionate twosome were embroiled in a domestic violence drama that left Brown, 19, booked on felony criminal threats charges and posting $50,000 bail after turning himself in to the LAPD on Sunday at 6:34 p.m. PST.

Sources say that Rihanna (real name: Robin Fenty), 20, was the victim in the alleged assault which occurred around 12:30 a.m. on Sunday. Responding to a 911 call about a disturbance, the LAPD took statements from a female with visible injuries, who named Brown as her attacker.

Just hours after the incident, witnesses spotted Brown and Rihanna leaving the London Hotel together around 7:30 a.m. on Sunday.

Later that evening, during the Grammy telecast for which both Brown and Rihanna were no-shows, bodyguards for the couple were seen moving their luggage out of the London.

The ramifications of Brown's arrest? Already charged with making criminal threats – defined in part as a situation where the victim "is in fear for [his/her] life" – the R&B singer may face additional charges at the discretion of L.A.'s district attorney's office.

To help him face the legal storm, Brown has hired attorney Mark Geragos, best known for defending convicted murderer Scott Peterson, Winona Ryder after a 2001 shoplifting arrest and Michael Jackson during his child molestation trial.

A day after Chris Brown was booked on felony criminal threats charges, he pulled out of the NBA All-Stars, a league spokesperson confirmed to Usmagazine.com.

"Chris Brown has withdrawn from NBA All-Star events," the NBA rep told Us Monday.

The singer was scheduled to participate in the basketball association's All-Star festivities in Phoenix Sunday and was also planning to play in a celebrity game two days prior to the event.
Brown, 19, has also had his ads with Wrigley gum suspended after the incident.

"Wrigley is concerned by the serious allegations made against Chris Brown," a company spokesperson tells Us. "We believe Mr. Brown should be afforded the same due process as any citizen.

"However, we have made the decision to suspend the current advertising featuring Brown and any related marketing communications until the matter is resolved," the statement continued.

The case is being presented to the Los Angeles County District Attorney’s office. Additional charges, including those of domestic violence, may be filed.