Chris Brown features on Rihanna's 'Unapologetic' album.

The 'Diamonds' hitmaker has unveiled the track list to her upcoming album today (06.11.12), including a track titled 'Nobody's Business' which is thought to be a duet with her on/off boyfriend.

The pair originally split up in 2009 after Chris assaulted Rihanna but they have recently been spotted out together and photographed looking close, sparking rumours they are a couple again.

'Unapologetic', which will be released on November 19, will also feature a collaboration with rapper Eminem titled 'Numb' and a track written by Scottish singer-songwriter Emeli Sande.

Rihanna has also recently announced details of her '777' tour to promote the release of 'Unapologetic', performing seven shows over seven days.

The tour will kick off in London on November 14 before travelling on a Boeing 777 jet to Paris, Toronto, Berlin, Los Angeles, Stockholm and finishing in New York.

The plane will include members of her fan club and 150 journalists.

Tracklisting to 'Unapologetic':

'Fresh Off The Runway'

'Diamonds'

'Numb' Feat. Eminem

'Pour It Up'

'Loveeeeeee Song' (Feat. Future)

'Jump'

'Right Now'?

'What Now'

'Stay' Feat. Mikky Ekko

'Nobody's Business' Feat. Chris Brown

'Love Without Tragedy / Mother Mary'

'Get It Over With'?

'No Love Allowed'

'Lost In Paradise'

'Half Of Me'