They got into an argument on North June Street, according to a Los Angeles Police Department statement.
Chris Brown stopped the car, the two got out, and the argument escalated, according to police. A witness called 911 and Chris left the scene before LAPD arrived.
Brown turned himself into the Sheriffs Department at 6:30PM EST accompanied by his attorney Mark Geragos and Geragos' investigator, Scott Ross. He is currently being held on $50,000 bail.
"He turned himself in around 7 p.m. to one of our stations and is being interviewed by detectives now," Officer Karen Smith confirmed to People.
The pair drove into a parking lot behind the police station on Venice Boulevard just east of La Brea Avenue in a black Cadillac Escalade. They entered through a back door where a posted sign read “authorized personnel only.” Police are expected to release a statement later this evening
Both Brown and Rihanna canceled their performances at tonight's Grammy Awards.
According to the Los Angeles Sheriff's Department, Chris made bail and was released at 8:35PM. He is due in court on March 5.