Niall Horan chats to delighted fans at Belfast City Airport belfastlive.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from belfastlive.co.uk Daily Mail and Mail on Sunday newspapers.
The famous twosome popped up for a session on Grafton Street in the Irish capital and performed several of their hits to ecstatic watching fans alongside amateur busker Jasper Koopman.