Nathan Sykes has unleashed his new duet with Ariana Grande.

The singer has teamed up with his ex-girlfriend for a surprise remake of his track 'Over And Over Again'.

Today (January 15) the song was debuted on the radio before going on platforms such as iTunes, Spotify and Vevo.

Grande posted on Twitter to Sykes: "Thanks for having me on this & congrats on the new incredible new music!"

The duo previously worked together on Grande's 2013 effort 'Almost is Never Enough'.

The two singers were in a relationship for a number of months before their split was revealed in early 2014.

Former Wanted man Sykes meanwhile is due to release his debut solo album later this year.

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Listen to the new duet below: