One Direction: "Filming For The 3D Movie Has Begun"

11 December 2012, 13:46 | Updated: 11 December 2012, 13:53

The 'One Thing' stars say they've had cameras following them around for a while as they prepare for summer blockbuster.

One Direction have opened up about their upcoming 3D concert film and reveled filming has already begun.

The 'What Makes You Beautiful' star's flick will also feature an in-depth behind-the-scenes look at the group, and Harry Styles told MTV they have been followed around with cameras for some time now.

"It's been good, we've had cameras with us for a while now," Styles said of filming. "It's just going to be nice, obviously, for the fans to see a bit more in-depth side of us."

The former X Factor stars also revealed how much they are looking forward to the opportunity to look back at the footage at a later date.

"It's going to be nice to watch it back as well and see the stuff we've been doing when we're a bit older," he added. "So that's exciting."

The band have enlisted the help of Super-Size Me director Morgan Spurlock for the movie, which will be released in cinemas in August 2013.

Meanwhile, the band were among the star performers at the Jingle Bell Ball 2012 this weekend.