The "Diamonds” singer just released the cover art for her next Top 40 radio single, which shows RiRi nuzzling the neck of her famous ex-boyfriend (the tattoo appears to match that of Brown’s).So, are they back together? Don’t count on it.It’s been exhausting trying to keep up with the Chris Brown, Rihanna, and Karrueche Tran love triangle. Even though Ri told Complex, "it’s nobody’s business” what goes on between her and Chris (lo & behold, their duet on her latest album, "Unapologetic,” is called "Nobody’s Business”) the duo seem to make it everyone’s business by constantly posting intimate photos of each other on Instagram.While their mixing of business with pleasure is confusing for most fans, it doesn’t seem to be a problem for Chris and Rihanna… on the business end, at least. Despite the personal drama, doing a duet with Chris was never an issue for Rihanna’s label."We don’t focus on the media, so it was never a question,” the singer told the magazine. "It’s all about the music. Everything else doesn’t even play a part in the studio.”In less-dramatic Rihanna news: Rihanna also announced today she would unveil her River Island collection during London Fashion Week on February 16.Might Chris Brown be in the front row at this invite-only event? Guess we will have to keep checking her Instagram to find out.Agencies