Rihanna Helping Police Investigate Chris Brown

Rihanna and Chris Brown at the Pre-Grammy Gala before the incident.

R&B singer helping the cops with their case.

According to the Los Angeles Times, Rihanna is assisting investigators with their case against Chris Brown. The 20-year-old singer is helping the authorities build a domestic violence case against Brown, her boyfriend.

According to police, Rihanna - whose full name is Robyn Rihanna Fenty - left a pre-Grammy Awards party with bruises and a scratch to her face. Some are reporting that her injuries were quite severe. She was treated at a "major medical facility," said a police source.

The alleged assault may have begun in the vehicle - a rented Lamborghini - that Brown was driving. Witnesses said they heard a loud confrontation. One of them reportedly called 911. The Lamborghini has now been impounded.

As we previously reported, Brown is currently facing criminal threats, though the L.A.'s district attorney's office may decide to charge him with additional crimes. That decision may depend, in part, on Rihanna and what she tells the authorities.