600 Directioners earned wristbands to camp out in the square for a prime viewing spot of the red carpet, putting them in touching distance of the band. An estimated 70,000 more are expected to arrive in central London to get a glimpse of One Direction.
The five-piece boy band is scheduled to appear Tuesday before the London premiere for "This Is Us," which was directed by "Super Size Me" director Morgan Spurlock and follows their life on the road.
The band held a press conference in London with Spurlock, during which band member Liam Payne said the film was "nerve-wracking" to make, but that if it is successful, he and his bandmates would consider filming a follow-up.
Swim Week Miami Beach 2014 [PHOTOS]