One Direction's "Unbelievable" And "Unreal" 'This Is Us' World Premiere [Pictures]

One Direction's This Is Us, a documentary following the band's rise from X-Factor contestants to one of the biggest pop groups in the world. The documentary premiered in London on Tuesday (20th August) in Leicester Square, London. Screaming fans awaited One Direction and the other celebrity attendees.

The band which consists of Harry Styles, Zayn Malik, Liam Payne, Niall Horan and Louis Tomlinson; all attended the premiere and greeted fans of the red carpet. The band was formed in 2010 on The X-Factor's seventh season. The group are one of the most popular in the world and this was reflected in the turnout of fans at the premiere. Fans were so determined to see their music heroes that some camped out in Leicester Square the night before.

The documentary, which was directed by Morgan Spurlock (Super Size Me), is due to be released on August 29th in the UK and August 30th in the US.

See more pictures from the This Is Us World premiere on Contactmusic.

Ulrika Jonsson with her daughter at the premiere.