TODAY | August 21, 2013
>>> we are just two days from one direction mania out here at rockefeller plaza and last night we got a preview as the world's most popular boy band premiered their debut movie. here's michelle kosinski .
>> reporter: standing room only crowd with braces, tears, hair and high pitched squeals camping for days. that is a toddler with a pacifier. that can only mean one thing. [ music playing ]
>> reporter: one direction.
>> they just changed my life.
>> reporter: you're not going to cry on me are you?
>> hang in there. hold it together girl.
>> reporter: it seems few can in their presence.
>> they're just really sweet and cute.
>> yeah, they're so cute.
>> reporter: yet these guys were unknown three years ago.
>> i decided to put you through.
>> reporter: put together for the competition show the x factor , they lost but simon cowell signed them and --
>> this is crazy.
>> reporter: selling tens of millions of records, sold out world tours. tens of millions of followers known as directioners.
>> if i tweeted i didn't like one direction would you come beat me up.
>> not that type of fan.
>> reporter: now a movie called this is us from the director of super size me.
>> it's the closest thing in my time i've ever seen to beatle mania.
>> reporter: these fab 5 performed at the olympics, graced gq, dated taylor swift and appeals to girls, and ladies around the world.
>> niles or harry?
>> none of them.
>> reporter: one stop to massive fame. michelle kosinski , nbc news london.
>> are you ready?
>> i don't know. let me see.
>> over here there's about 80 people camped out including a couple of infants across the street.
>> you're kidding.
>> i think those puppies were here actually.