Amber Rose isn’t the only one who has a bone to pick with Natalie Nunn. According to sources, the “Bad Girls Club” star has been dating Rihanna‘s cousin … and she isn’t taking it too kindly!

“Natalie Nunn is crazy in love with Rihanna’s cousin, and she’s smokin’ mad. Rihanna is angry because Natalie badmouthed her for a long time after the rumors came out that Natalie was dating Chris Brown,” one source told Radar Online.

Lately, Nunn and RiRi’s cousin “have been in Los Angeles for over a month together, and Tee-Jay hasn’t gone home or visited Rihanna so she wrote a nasty tweet” the source says.

Below is the (alleged) tweet Rihanna sent to Natalie:

@Natalie Nunn U made My cous go MIA on a Mohf**ka

The source also went on to add that Natalie is really feeling Rihanna’s cousin … and doesn’t plan on ever “giving him back” to Rihanna. Whatever that means.

“Natalie’s thinks Rihanna’s cousin is a cute, sweet boy, raised properly, and she said she never wants to give him back. I think Rihanna’s feeling protective of him because she and Natalie have had a bumpy past.”

Don’t worry RiRi … give Natalie a week or two and she will be on to something new!