Emeli Sandé has revealed that she has written a song for Rihanna's upcoming new album.

The 'S&M' star is set to unleash her seventh studio album 'Unapologetic' on November 19 and the release is highly anticipated.

The album's lead single 'Diamonds' hit No.1 in the UK chart upon release and the singer has just unveiled the album's tracklisting - and a new Chris Brown duet in the process.

Speaking at the MOBO awards on Saturday (November 3) - where she won three awards - Sandé confirmed that she wrote a track for 'Unapologetic' - but she doesn't know how it will sound. She said:

"It's on the new album and I love it. I love the lyrics and I can't wait to hear what she's done with it."