Chris Brown must be thinking twice about ever letting this go.Fresh off another reported split with her ex, Rihanna headed to Barbados for a getaway with her one of her best girlfriends. The "Diamonds” singer was spotted flaunting her fabulous figure Tuesday in a teeny bikini at a private beachfront villa.With a beer and sunscreen in hand, the superstar seemed completely relaxed as she hung out on a balcony with her friend.After tweeting intimate pictures of herself jetsetting around Europe with Brown, 23, RiRi confirmed that she was unattached Tuesday by posting a "rih-card” on Instagram that read:"Being single sucks. The only thing I get to do anymore is whatever the f--k I want to do.”Rihanna’s declaration came around the same time that Chris was spotted with on-again off-again girlfriend Karrueche Tran. Pal Christina Millian even said on "The Wendy Williams Show” this week she believed the two of them were still together."You know what, from what I've always known, she's his girlfriend," Milian said of Brown and Karrueche, "That's where it lies for me. I see everything in the media. I really don't get into the detail of it, but I think everybody has their own life and how they deal with things.”OMG