A source told Life & Style Weekly magazine: "Chris is already building his case. He's saying she threw a phone at him, then hit him in the head and basically just lost it. He's saying she attacked him."
Chris was arrested on February 8th for allegedly assaulting Rihanna after the Clive Davis pre-Grammy party the night prior, but was released on $50,000 bail.
The DA is planning on postponing the case that was set for March 5th in order to gather up more evidence.
A statement from Los Angeles district attorney spokeswoman Jane Robison reads, "We don’t have the evidence yet. (Los Angeles police detectives) are still investigating.
"If (detectives) determine they need more time they’ll set a new date for him (Brown) to come into court. He only has to come back if and when we file charges."
Meanwhile, Rihanna is currently in Mexico in Punta Mita vacationing oceanside with her friends in a private villa.
According to witnesses, the injuries she sustained from her altercation with Chris Brown were not visible on her face.
More details coming soon!