One Direction star Niall Horan donned his suit today (March 27) for his brother's wedding.

The global star is the best man at Greg Horan's wedding, which is taking place in hometown of Mullingar, Ireland.

Pictures have emerged of the 'Live While We're Young' singer wearing a suit as he prepared to go to the ceremony, which is said to have been for 150 people.

A camera crew and director Morgan Spurlock were also spotted on the Mullingar streets as they filmed scenes for the upcoming One Direction film This Is Us.

The Irish Independent report that the crew will also film the wedding celebrations.