Chris Brown is accused of cheating on his pop star girlfriend, Rihanna, with a brunette model Natasha Ellie.

The 19-year-old singer, who is facing charges felony assault and making criminal threats following his alleged assault of Rihanna last month, has reportedly been having an affair the 27-year-old beauty.

According to an OK! Magazine insider: “Rihanna has been having problems with this girl for a long time. Rihanna even reached out to Natasha, but she denied everything.”

It has been claimed that Natasha sent the three-page text message which sparked Chris and Rihanna’s argument, during which the R&B crooner allegedly punched, bit and choked the singer until she was unconscious. Natasha, who lives in Los Angeles, and has worked as a runway model and R&B music video model for artists like R. Kelly and Akon.

“Have you heard the song ‘Emergency Room’ by Rihanna? In the lyrics she mentions finding Natasha’s number in Chris’ jeans. Rihanna didn’t write the song, but she met with the songwriter and told her how she felt and what she was going though and they came up with it,” the insider adds.

“‘Emergency Room’ includes the lyrics: “I was pickin’ up your clothes in the closet/ I was bout’ to throw your jeans in the washer/ ‘Til I saw a piece of paper sayin’ “Tasha”/ I gotta say I found this a bit shockin’/ And some reciepts here that say you went shoppin’/ You bought some Nike shoes/ But why you buyin stockings?/ Boy how could you lie to me?/ I thought you would die for me/ I’m not accepting another apology.”

A rep for the model denies she had a relationship with Chris, but confirmed that the pair met in Miami two years ago.