Bruno Mars has unveiled a brand new track.

The singer has premiered the song 'When I Was Your Man' on YouTube as he builds up to the release of his forthcoming new album.

He is unleashing his sophomore record 'Unorthodox Jukebox' on December 10 in the UK and a day later in the US.

His lead single from the album - 'Locked Out Of Heaven' - was previously released to huge acclaim and it seems 'When I Was Your Man' is set to follow suit.

Tweeting about the song prior to unveiling it, Bruno Mars said: "Soon you guys will hear a song I wrote called When I Was Your Man. I've never been this nervous. Can't explain it."

'Unorthodox Jukebox' will mark the follow-up to the music maestro's 2010 debut record 'Doo-Wops & Hooligans', which hit No.1 in the UK charts.

As previously reported, Mars recently appeared on iconic US TV show Saturday Night Live both as a performer and a host.