Whenever there's a domestic dispute involving a famous couple and concerns of the guy sleeping around, it's a safe bet that Paris Hilton's name will emerge eventually. It seems that during the same weekend before Chris Brown got all fisty with Rihanna he was spotted flirting with Paris.

Things got worse the following evening at the Verizon & BlackBerry Storm Grammy party at Boulevard 3, where Chris chatted up Paris Hilton while Rihanna performed.

"He and Paris went outside together," a witness tells OK!. Back inside, they got closer. "Paris was all over him," the partygoer says. "Rihanna caught wind of it and spent the rest of the night glued to him." (OK! Magazine)

It's no wonder Rihanna was pissed. Merely brushing up against Paris Hilton can supposedly give you herpes, and if your man is speaking to her in public it's essentially a proclamation that he's looking to screw around with any whore that happens to be nearby. Now how exactly this all translates into him beating the crap out of his girlfriend is a mystery, although there are rumors circulating of a booty call text message from an ex-girlfriend.

Also, as much as it pains me to admit this, Paris was actually looking pretty good this past weekend. Here she is arriving to the Grammy Awards. No, I don't know why she was invited.