Chris Brown & Rihanna at King's Dominion

Once again, “sources” are dropping off tips quicker than anyone can keep up. But for some reason, this story seems to make the most sense. We have to make it clear that we’re not taking sides and you shouldn’t either. At least wait until all of the facts come out and official statements are made by the respective camps. For now, anything that is published (here, or anywhere else) that is not from Rihanna, Chris Brown, or any named person close to them should be taken with a grain of salt. All of these unnamed sources do not, and should not count.

Anyway, sources claiming to be close to Chris Brown and Rihanna told Bossip that Rihanna started the physical portion of the fight and it was all over a phone call Chris received from another young lady. The source also added that Chris’ faithfulness to Rihanna had been questionable the past few months.

They were in the car leaving the Clive Davis party. While Chris was driving, he got a phone call from a young lady. Our source tells us that Rihanna knew that Chris had been messing around with this particular girl and she has, as of late, been the reason for many of their heated arguments. Rihanna got a glimpse of the phone, saw the name and number and immediately recognized who it was. She went ballistic and began to “beat the sh*t” out of Chris (while driving). She was so uncontrollable, that Chris began to fight back in self defense, which ensued the fight. Rihanna’s rage stemmed from Chris’ questionable fidelity in the last few months.

SOURCE