Rihanna reveals Chris Brown collaboration on Twitter

Rihanna spent the weekend celebrating the completion of her much anticipated album Unapologetic, but it seems theres no rest for the wicked.

Last night, pictures emerged of the star leaving rehearsals in New Yorks Gansevoort Hotel for tonights Victorias Secret Fashion Show. The Diamonds singer looked worn out, with her ever-changing hair looking rather bedraggled. She sported a casual look, matching her grey trousers with a grey Chanel jumper, though she dressed up the outfit with strappy black heels and a black Chanel bag.

Rihanna is expected to perform one of her many hits at the lingerie show later, as well as Justin Bieber, who will also take to the stage.

The Umbrella singer revealed on Twitter yesterday, that Chris Brown collaborated on Track 11 of her new album. The song is entitled Nobodies Business, which seems an appropriate reflection of the stars feelings towards judgement on her relationship with Chris Brown.

The duos relationship status has long been the subject of speculation, following Browns arrest and consequent conviction for assaulting Rihanna after the 2009 Grammy Awards. The 23-year-old singer was ordered to complete community service and a domestic violence programme, and was not allowed within 50 feet of Rihanna for two years.

The pair have been pictured on numerous occasions since Chris Brown announced his split with model Karrueche Tran, most recently at Rihannas Halloween party.

Rumours are circulating that the two singers plan to announce that they are officially back together after the release of Ri-Ris album on November 19.