ONE DIRECTION star NIALL HORAN is stepping behind the camera to shoot a portion of the group's upcoming concert film.

The One Thing hitmakers are following Justin Bieber and Katy Perry onto the big screen by releasing their own 3D movie next summer (30Aug13) and it appears the Irish singer is getting in on the action by helping to capture some of the footage.

Bandmate Louis Tomlinson tells MTV News, "Niall's got a camera, so he's going to film some of the film."

And Horan insists he already has a handful of good clips.

He adds, "We've already kind of started and the cameras are already coming out on the road with us a bit more now... Hopefully it'll turn out as well as we want it too."

The U.K. group has enlisted Morgan Spurlock, the brains behind fast food documentary Super Size Me, Where in the World Is Osama Bin Laden? and last year's (11) The Greatest Movie Ever Sold, to direct the film and the 19 year old insists the documentarian is the perfect fit for the project.

Horan adds, "Morgan works well because... he did a lot of documentary movies. That's more like what we want our movie to be. It's going to be a concert movie, but with a documentary side... so we wanted to get our personalities across because the fans know us, but we want them to know us deeper."