Even with its long history of hosting film premieres, London's West End has never seen anything quite like this. Tens of thousands of fans have been cramming themselves into every corner of Leicester Square since first thing this morning, to get a glimpse of One Direction.
Sangeeta Kandola went to meet their dedicated army of fans.
One Direction have told ITV News that although the comparisons with The Beatles are "flattering", it was not something they agreed with.
Directioners descended into London's Leicester Square in their thousands this evening, for the world premiere of One Direction: This is Us.
One Direction's first movie premieres today ... but what does it have in store for the boyband's fans?