A video of Niall Horan singing One Direction's hit song 'What Makes You Beautiful' at a pub lock-in has been posted online.

The lads have been enjoying a bit of downtime back home after coming off their first ever headline North America tour earlier this year.

They have played the occasional gig since - including a little show at the London 2012 Closing Ceremony - as they keep the momentum going.

A video has emerged online today (August 17) however showing Niall Horan flexing his musical muscles at a somewhat less glamorous venue than they are used to - a pub.

The Irishman is seen with friends as they all join in on a sing-song of One Direction's smash hit 'What Makes You Beautiful'.