PHOTOS: Bikini-clad Rihanna Shows Off Six-Pack, Chris Brown Is Nowhere Around

After the pressures of debuting her first fashion range at London Fashion Week no-one would begrudge Rihanna a few days off. And the pop star seemed to be making the most of the rare spot of R & R as she relaxed in a bikini on Tuesday ahead of her 25th birthday.

Staring suggestively at the camera Rihanna pulled on the straps of her tiny string bikini.

The shots revealed the Barbadian beauty's incredible toned stomach, with her six-pack clearly visible. But while Rihanna appeared to be having fun, there was no sign of her on/off boyfriend Chris Brown. While Rihanna had spent the weekend working in London, Brown was in Houston where he headlined the NBA All Star weekend. Also in Houston was his ex-girlfriend Karreuche Tran, who was spotted partying at a different nightclub to the rapper.

While they were not photographed together, Karreuche raised eyebrows when she tweeted a picture of an ornate ceiling on Saturday with the caption 'Gnight'. The picture was reported to be of the inside of a mansion hired by Brown for himself and a group of friends for the holiday weekend.

Karreuche soon deleted the picture, but not before it had sparked speculation that she was staying with her ex. Rihanna and Brown only went public with their reconciliation at this month's Grammys, yet various reports have since emerged that their romance has already soured.

Source: Legit.ng