Rihanna has re-iterated that her on-and-off again relationship with Chris Brown is "nobody's business," but she may have brought more attention to them thanks to her recent tweet.

The "Diamonds" singer released the official cover art for her new single "Stay" on Twitter on Jan. 16. The image showed RiRi snuggling into the neck of a heavily tattooed mystery man who appears to be Brown. The as-yet-identified man's face isn't visible, but her "Rihanna Navy" fans commented on the social media site saying it is indeed Brown. She also released the cover art for her other upcoming song "Pour It Up."

Complex magazine released seven different covers featuring Rihanna for its February/March 2013 issue. In the cover story, the writer asked the Bajan beauty if her relationship with Brown is "nobody's business," then why did she record the song with him?

"Pardon me? It's the truth. Remember?" Rihanna told Complex. "It's a fun record that The-Dream wrote and we loved the lyrics. You're still asking me questions about it so clearly you don't know."

Despite Rihanna defending the relationship at the time the interview took place - in November during her "777" tour- the couple have been on the outs for the past week and according to a report, Brown is "sad" about it.  

The "Umbrella" singer was seen having dinner with her ex-boyfriend Matt Kemp on Jan. 13. Kemp, 28, who is an outfielder for the Los Angeles Dodgers, met with Rihanna for dinner at a Los Angeles restaurant. The meeting occurred after she tweeted a series of cryptic messages on Twitter and Instagram that may have alluded to Brown.

Rihanna met with Kemp after posted a photo on Instagram on Jan. 10 of Donald Duck with the caption: "I have to stop saying 'How stupid can you be' I think people are starting to take it as a challenge."

On Jan. 11 she tweeted: "boys will be boys!!! Cause they can't be men!" 

Tags: Rihanna rihanna and chris brown Chris Brown and Rihanna