Chris Brown cheated on Rihanna with a model, alleges.

The 19-year-old singer — who has been charged with felony assault and making criminal threats following his alleged assault of Rihanna last month — was having a relationship with 27-year-old model Natasha Ellie, the website says.

It has been claimed Natasha sent the three-page text message — initially reported to be from someone who Chris “had a previous sexual relationship with” — which sparked Chris and Rihanna’s argument, during which he allegedly punched, bit and choked the singer until she was unconscious.

A source said: “Rihanna has been having problems with this girl for a long time. Rihanna even reached out to Natasha, but she denied everything.”

Natasha may even have been mentioned in the lyrics to Rihanna’s song Emergency Room: “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 receipts 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.”

The model’s representative has denied the model had a relationship with Chris, but confirmed the pair met in Miami two years ago.

Meanwhile, rumours are flying that Rihanna and Chris Brown made a sex tape, adds.

The pair are said to have filmed themselves engaging in a series of “kinky” acts.

A source told Star magazine: “Chris and Rihanna enjoy an aggressive love life that would shock many people. Rihanna loves dressing up — including as a dominatrix — and role playing. They both have kinky sides.”

The source added: “Rihanna has no issues with her sexuality. She can be really out there. But she’d be mortified if her friends and family found this out.

“Rihanna isn’t always the little goody-two-shoes everyone thinks she is, and Chris doesn’t want or need another scandal.”