Rihanna is prepared to testify against her boyfriend Chris Brown over charges he assaulted her.

The singer's attorney said Rihanna - real name Robyn Rihanna Fenty - would be required to give evidence if issued with a subpoena.

Brown, 19, has been charged with assault and making criminal threats against a woman referred to in court as Robyn F.

Rihanna, 21, has not publicly commented on the case or a photo of her reported injuries.

In court, documents revealed that Brown is accused of attacking Rihanna after an argument broke out over a text from another woman.

He apparently tried to force her out of their rented Lamborghini, hitting her head against the passenger window and punching her in the face.

The alleged incident took place hours before last month's Grammys, with both stars cancelling their appearances at the event.

Brown is due in court next on April 6th.

07/03/2009 14:53:42