1D mania hit London, as chart-topping boyband One Direction attended the world premiere of their film, One Direction: This Is Us.
Thousands of screaming fans, some of whom had camped out overnight, greeted the award-winning group - comprising of 21-year-old Louis Tomlinson, Zayn Malik, 20, and 19-year-olds Liam Payne, Harry Styles and Niall Horan - as they arrived at the Empire cinema in London's Leicester Square.
"This is unreal," said Harry.
Niall added: "This is amazing. We're really excited to be here. We can't believe we are here. "
This is just unbelievable. The last few years have been amazing. This is what we've been dreaming of."
The 3D film, directed by Super Size Me film-maker Morgan Spurlock, is a behind-the-scenes look at the band as they embarked on their mammoth This Is Us world tour.
Harry said the "intimate all-access" film is a love letter to their fans, known as Directioners.
"We made this for the fans. We just want to say a massive thank you to them," he said.
X Factor alumni such as Little Mix, JLS, Diana Vickers and Amelia Lily were joined by the show's host Dermot O'Leary and Cowell's right-hand woman Sinitta at the premiere, which was streamed live in other countries.
One Direction: This Is Us opens in cinemas on August 29.