Tabloid insiders are blaming a pair of flirtatious moments with multiplatinum-selling recording artist Leona Lewis and Hollywood socialite Paris Hilton for Sunday morning’s domestic dispute between R&B stars Chris Brown and Rihanna.

According to OK! Magazine, tensions between the young lovers reached the boiling point at Verizon & BlackBerry Storm Grammy Party at Boulevard 3 on Friday night, where the “Run It” chatted with Hilton while Rihanna performed.

“He and Paris went outside together,” says a spywitness. “Paris was all over him. Rihanna caught wind of it and spent the rest of the night glued to him.”

Star Magazine, on the hand, reports that Chris appeared distant from his girlfriend Rihanna at music mogul Clive Davis’ annual pre-Grammy Bash in Beverly Hills on Saturday. That’s when the young crooner turned his attention to British hummingbird Leona Lewis, says a mole.

“At one point, Rihanna caught Chris flirting with Leona. They were carrying on and laughing, and Rihanna saw Chris with his hand on the small of Leona’s back. It may have been innocent, but that set Rihanna off.”

Police at the scene of Sunday’s brawl reportedly found Rihanna with “horrific” injuries, including major contusions on both sides of her face, a black eye and split lip, bloody nose, and bite marks on various body parts of her body.