London, Feb 12 : Pop-singer Leona Lewis has denied reports that she sparked a row between Chris Brown and his girlfriend Rihanna, which resulted in him allegedly assaulting the `Umbrella' singer.

According to reports, Rihanna was angered after she apparently caught Brown speaking to Lewis at a pre-Grammy awards party in Los Angeles.

"Rihanna saw Chris flirting," the Mirror quoted a source, as saying.

"He and Leona were laughing, and Rihanna saw his hand on the small of her back. It was totally innocent, but that set Rihanna off," the source added.

Brown and Rihanna later left the party at LA's Beverly Hills Hilton and drove off in Brown's Lamborghini.

However, sources have confirmed that Lewis and Brown had spoken but said the `X Factor' winner had done nothing to cause the incident that followed.

"Leona is very happy with her boyfriend Lou and it was totally innocent on her behalf. She wasn't flirting," a source said. (ANI)