Even Brit boyband McFly were there! Do you like their rock-star style?
Louis and Niall were amazed at how many Directioners turned up to their London premiere.
One Direction pose on the 'This Is Us' red carpet in black and white outfits. Niall described the premiere as "unbelievable" and "amazing".
Louis Tomlinson made the fans' day by signing autographs. What 1D merchandise would you have Liam sign?
Harry is amazed at the number of fans there, while Zayn looks on. Some fans stayed overnight to get a spot at the front!
Zayn Malik's date Perrie Edwards and her band, Little Mix supported their X Factor brothers One Direction.
The 1D boys looked out on a sea of super excited Directioners - all hoping for a glimpse of THE boy band of 2013.
Inside the theatre, One Direction posed with Simon Cowell, the X Factor judge who first saw the boys' potential as a band.
Harry Styles signed autographs for loads of the waiting Directioners. What 1D merchandise would you ask Harry to sign?
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