'What makes a girl beautiful?'

Get a load of this vintage One Direction video, as we caught up with the boys in 2011 for their first appearance back on The X Factor since winning the show the year before.

On the agenda? What it feels like to play at Wembley, what really makes a girl beautiful, and a strange revelation from Niall about his pants...

Watch 1D team up with JLS for a megamix X Factor performance