THEY'RE set to be the first billion-dollar boy band in history. Sophie Herdman meets the lads behind the hype.
HIDDEN away at a secret location, five boys and a ginger-haired middle-aged man are sitting at a table.
To many, the boys are instantly recognisable as Liam Payne, 19, Harry Styles, 19, Niall Horan, 19, Zayn Malik, 20, and Louis Tomlinson, 21. Or, in other words, One Direction.
The middle-aged man is American documentary-maker Morgan Spurlock, the lucky person tasked with making the One Direction film, This Is Us.
As you'd expect, the film is 93 minutes of pure, unadulterated One Direction, featuring live performances from their worldwide tour, the boys backstage, in their hotel rooms, on the tour bus and exploring the many cities they visit.
They have a huge fan base, including four million devotees who call themselves "Directioners" and each spend an average £1,000 following the band around the world.
The recent premiere for This Is Us was a classic example of their dedication: more than 300 Directioners arrived a day early, camping in London's Leicester Square overnight. By the time the premiere started, 2,000 fans had turned up, all hoping to catch a glimpse of the boys.
Styles said their fans were the reason they decided to make the film. "With social media and 10-minute interviews, there's only so much you can get across in terms of your personality, so this is a way for us to show what we're like, for the fans to see," he says.
One Direction have had a dedicated following since their inception on 2010's X Factor, when the five schoolboys, who'd all auditioned as solo artists, were brought together by Simon Cowell.
Despite only coming third in the series, they've had unprecedented success since, even in America, a famously tough market to crack.
Their two albums, Up All Night and Take Me Home, have broken records across the globe, while Live While We're Young, a track from the latter album, reached the top 10 in almost every country it charted in.