Thousands of One Direction fans have descended on Leicester Square for a prime red carpet spot ahead of the premiere of the boyband's new film.
Dozens of Directioners, as the group's fans are known, who camped out overnight have been joined by masses more from around the UK, with some singing the band's hits and others wearing masks of the lads.
The five-piece are scheduled to appear on the red carpet before their film, One Direction: This Is Us, is screened in London.
The film has been made by Super Size Me director Morgan Spurlock and follows their life on the road during their rise to worldwide fame.
The band - Liam Payne, Harry Styles, Zayn Malik, Niall Horan and Louis Tomlinson - held a press conference in north London with Morgan where Liam said the film was "nerve-wracking" to make, but admitted there could be a follow-up if it is a hit.
Liam also said it was "difficult to watch" the new film because it showed how upset their parents were when they left home to tour the world.
One scene features his father talking about how much he misses his son.
The star told BBC Breakfast: "For me that was a bit difficult to watch. He's always so happy when I see him and happy to have me home; to actually see what he's like when I'm not there was a bit mad."
Bandmate Louis agreed it was "tough" for their parents.
He said: "You know a lot of families anticipate that once you get to 18 you'll go to university and mothers know that that's the day, whereas for us it kind of just happened out of the blue and our mums just had to wave goodbye to us on The X Factor, so I think it was a lot for them to take in at first."
The boyband have topped the charts on both sides of the Atlantic, becoming the first British act to top the US Billboard chart with their debut album.
Louis said one advantage of making the film was it helped them remember everything that had happened to them in the last few years.
He said: "Because so much is happening to us, you kind of just lose it all. It's great just to sit back and watch it back and remember and relive those moments."
Harry said the film would allow fans to learn more about them, adding: "We just want to show what we're about and with social media and stuff there's only so much you can get across in terms of your personality."
Organisers have been encouraging people to stay away from the premiere and watch from home.
They said: "Event staff on the ground, the Metropolitan Police and Westminster City Council will be working together to ensure the safety of fans, guests and staff on the day.
"We would like to remind fans that the red carpet is being streamed live all over the world, so they can get the best views from the comfort of their own homes."