One Direction Gets Felt Up
One Direction Performs 'What Makes You Beautiful'
One Direction Performs 'Live While We're Young'
Exclusive! One Direction Backstage Pass
Exclusive! Thrown Onstage at One Direction
One Direction Talk Dating
Exclusive! Ellen and One Direction Commercial Break
Niall is the best with that booty and the willingness to use it.
Sources:1, 2, 3, 4, 5, 6, 7
I screencapped the pictures myself so there is no source for them.