One Direction heartthrob Niall Horan took time out from his boyband duties today (March 27) as he attended the wedding of his older brother, Greg.

The superstar obliged fans by signing autographs and posing for pictures with a number of them both before and after the ceremony, which was held at St Michael's Church in Castletown Geoghegan in County Westmeath, Ireland.

Photographs of the 'Little Things' singer have been shared online and he can be seen wearing a well-fitting suit and eye-catching candy striped tie.

His brother, Greg, recently spoke to the Irish Sun about his impending nuptials and revealed that Horan was set to give a best man speech at the celebration: "He has been working on the speech as far as I know so we will see how that goes. He’s my only brother — there was never any other choice for my best man than Niall."

Watch footage of Horan at the wedding below: