One Direction give Christmas surprise to sick children at Ninewells

One Direction members, from left, Harry Styles, Louis Tomlinson, Liam Payne, Zayn Malik and Niall Horan perform in New York this week.
One Direction members, from left, Harry Styles, Louis Tomlinson, Liam Payne, Zayn Malik and Niall Horan perform in New York this week.