Boyband One Direction have opened up about their forthcoming documentary film, which will be directed by 'Super Size Me' star Morgan Spurlock.

Referring to Spurlock's previous McDonalds shock-documentary, member Liam Payne joked: "That's going to be part of the film. Eating McDonald's onstage for 30 days."

The lads all agreed that the movie will be something they can look back on when they're older and will cherish the memories they made together, and Niall Horan told MTV News: "Morgan works well because like you said, he did a lot of documentary movies."

"That's more so what we want our movie to be. It's going to be a concert movie, but with a documentary side than concert side so we wanted to give it like get our personalities across because the fans know us, but we want them to know us deeper."

Louis Tomlinson and Payne also expressed their excitement at the project acting as a kind of keepsake for the group: "it's going to be amazing for us to look on in like however many years and just be like 'This is when I was a lad'."

"You know what we always say, when we left home to do 'X Factor' our parents were like 'Make sure you take loads of pictures,' but we've got a film to do that for us now so we can be lazy."