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3 April 2013, 09:15
The 'What Makes You Beautiful' star was filmed performing the live rendition during his recent stay in Ireland.
One Direction star Niall Horan was seen performing a solo acoustic version of the band's smash hit 'Little Things' to a packed Irish pub recently.
The 'Live While We're Young' star surprised those in attendance when he got on stage for a rendition of the track.
The moment was captured by one of the crowd on their smartphone and posted online.
The boyband star was back in his home country of Ireland last week as he attended his brother's wedding – where he was also the best man.
The singer and the rest of One Direction are currently on the road for their 'Take Me Home' UK tour – which is in the middle of a five-night residency at London's O2 Arena.
Watch Niall Horan performing 'Little Things' at an Irish pub below:
Meanwhile, the band are also gearing up for the release of their first ever 3D concert movie this August.
The film will be called This Is Us and is being directed by Super Size Me star Morgan Spurlock.