Heartthrobs One Direction have promised fans that their forthcoming film will be very revealing.

During an interview with heat magazine, the lads explained that even their "intimate nights" will be chronicled in the picture, which is set to be directed by 'Super Size Me' star Morgan Spurlock.

"It’s just going to be the stuff you don’t get to see, the day to day waking up in the morning, actually travelling," said Zayn Malik.

Member Louis Tomlinson added, “those intimate nights”, to which Malik replied, "to the places we travel, exactly those intimate night times Louis, thank you. The bits you don’t get to see. The bits in between.”

Singer Liam Payne chipped in and explained that fans might be surprised to see that they can be "big d**kheads.”

Check out the official preview of the lads' Comic Relief single below: