One Direction: This Is Us Movie Reveals Truth
One Direction star Liam Payne said making the boy band's new film was "nerve-wracking" - but there could be a follow-up if it is a hit.
Bandmates†Liam Payne, Harry Styles, Zayn Malik, Niall Horan and Louis Tomlinson have been speaking at a news conference in London ahead of the premiere of One Direction: This Is Us.
The film, made by Super Size Me director Morgan Spurlock, follows their life on the road during their rise to worldwide fame.
Payne said: "I think at the moment we just want to see how this one goes to be honest with you.
"It's so nerve-wracking making the film and stuff. I was thinking the other day when we sit in the premiere and everybody is actually watching it on the big screen it's going to be amazing but I don't know, maybe we'll see how this one goes, see if people like it."
The boyband, who were brought together on The X Factor, have topped the charts on both sides of the Atlantic, becoming the first British act to top the Billboard chart with their debut album.
Tomlinson said one advantage of making the film was it helped them remember everything that had happened to them in the last few years.
He said: "Because so much is happening to us you kind of just lose it all.
"It's great just to sit back and watch it back and remember and relive those moments."
Styles said the film would allow fans to learn more about them, saying: "We just want to show what we're about and with social media and stuff there's only so much you can get across in terms of your personality."
Tomlinson said: "We like to think we're rock 'n' roll but we're not really."
Spurlock said fans would enjoy seeing how "normal" the band are.
He said: "There is no air of superiority, there is no air of success that permeates this movie.
"You see five guys who are the same five guys they were three years ago."
Huge numbers of fans are expected to descend on Leicester Square ahead of the premiere on Tuesday.
There are concerns after police were called to control the crowds at a screening of the film in Los Angeles last week.
The band's hardcore fans, known as Directioners, have been staunchly protective in the past and launched attacks against critics of the band.
The group have sold 19 million singles and 10 million albums and are expected to gross $1bn (£640m) in the next year.