One Direction recently paid a visit to Amazon's headquarters to sign copies of their debut album, 'Up All Night', and stayed for an exclusive interview to talk about The X Factor and their relationships with each other now they're a successful band. 

The 'Gotta Be You' superstars opened up about living together as both teenage boys and a successful music group, and explained that Liam Payne takes the longest to get ready if they're heading for a night out.

Niall Horan joked: "If we're going out at ten, he has to start getting ready at seven."

Speaking about The X Factor, the group are collectively backing Little Mix to win, but would still be pleased if Amelia Lily took this year's title and when asked what their dream musical collaboration would be, One Direction yelled in unison: "Bruno Mars!" Payne added that Mars is consistently "making great music".

Watch the full interview with the boys here: