One Direction aren't upset their new album has leaked online.

The 'Steal My Girl' quintet release latest LP 'Four' today (17.11.14) but many fans have already heard some of the songs thanks to unauthorised versions being posted on the internet and though they think it's ''crazy'' it happens every time they have new music, the group don't worry too much.

Liam Payne said: ''It's crazy that it happens every time but we try not to get too a***y about it.''

Harry Styles added: ''Usually it's a couple of days before but this time it was over a week.''

One track on the album the group - which also includes Zayn Malik, Louis Tomlinson and Niall Horan - are particularly pleased with is '18', which was written by their friend Ed Sheeran.

Liam told The Sun newspaper: ''He sent the song through to Simon Cowell, who sat down with him. It's a great song. It tied into some of the bits we had missed when we were writing the album.

''It was one of the later ones we recorded but it fitted in so well. It's top dollar.''

Earlier this year, the 'Little Things' singers embarked on a huge global stadium tour and they enjoyed playing massive venues because it meant they could do fewer shows and have more free time.

Liam said: ''We got more time out and got to do a lot more in a lot of countries. This will be the tour we will all remember.''