The title says it all. What else can I say, except... 

"I want you to meet Leeroy, he's gonna be your choreographer. LeErOy, MhM!"

"Hi boys, hi! Okay so here's what I'm thinking; first of your number's gonna be really big. Stay with me 'cause I'm quite quick and 5, 6, 7, 8 and 1, 2, 3, 4, 5, 6, 7, 8 and Niall for the shimmy, for the shimmy, for the shimmy and Zayn pirouette and Louis do the splits and Liam you stay exactly where you are because you are PER-FECT"