Union J have premiered a new song online.

The Brits have debuted the track 'Tonight (We Live Forever)' as the first cut from their upcoming second album.

The single will be released on August 17 and the lads have released a lyric video for the song.

Union J had earlier debuted the song on Capital FM this morning (June 19), with the band tweeting:

"Our brand new single 'Tonight (We Live Forever)' is here!! Thank you for having us @CapitalFM #UnionJTonight."

The former X Factor finalists meanwhile released their self-titled debut album in 2013 after finishing fourth on the TV show in 2012.

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Watch Union J's new lyric video below: