Nick Carter(01 of32)
Open Image ModalThe classic middle part haircut. Girls all over the world swooned. (credit:Ron Wolfson/WireImage)
AJ McLean(02 of32)
Open Image ModalAJ was in a rebel phase. (credit:Dave Hogan/Getty Images)
Kevin Richardson(03 of32)
Open Image ModalNothing is sexier than a man with an unkempt shag? (credit:SGranitz/WireImage)
Kevin Richardson(04 of32)
Open Image ModalThe first of many appearances of Kevin's famous goatee. (credit:Ron Galella, Ltd./WireImage)
Howie D(05 of32)
Open Image ModalSlicked back curls... how very European of him. (credit:Ron Galella, Ltd./WireImage)
Kevin Richardson(06 of32)
Open Image ModalHe finally trimmed his shag! (credit: Richard Corkery/NY Daily News Archive via Getty Images)
Howie D(07 of32)
Open Image ModalHOWIE! Why are you flat-ironing your luscious locks? (credit: Richard Corkery/NY Daily News Archive via Getty Images)
Nick Carter(08 of32)
Open Image ModalThat blond strand of hair made all the girls swoon. (credit: Ron Galella, Ltd./WireImage)
Howie D(09 of32)
Open Image ModalAll Howie needs is a sword in his hand and he would be easily mistaken for a musketeer. (credit:KMazur/WireImage)
Backstreet Boys(10 of32)
Open Image ModalLook how serious their hair is! (credit:Ron Galella, Ltd./WireImage)
Nick Carter(11 of32)
Open Image ModalEvery boy who was born in the '80s had this hair. (credit:Time & Life Pictures/Getty Images)
Brian Littrell(12 of32)
Open Image ModalBrian really never changed his hair from the curly at the front, straight at the back style. (credit:Time & Life Pictures/Getty Images)
Howie D(13 of32)
Open Image ModalControl those curls, Howie! (credit:Time & Life Pictures/Getty Images)
Kevin Richardson(14 of32)
Open Image ModalThe goatee really highlights his cheekbones. Love those tinted tips! (credit:Time & Life Pictures/Getty Images)
AJ McLean(15 of32)
Open Image ModalOne must always match their hair to their animal-print jacket. (credit:Time & Life Pictures/Getty Images)
Kevin Richardson(16 of32)
Open Image ModalThis is probably the best Kevin's ever looked. Seriously. (credit:ShowBizIreland/Getty Images)
AJ McLean(17 of32)
Open Image ModalAJ can't even manage a real mohawk. (credit:Ethan Miller/Getty Images))
Brian Littrell(18 of32)
Open Image ModalYep, Same hair, just older. (credit:Ethan Miller/Getty Images)
Nick Carter(19 of32)
Open Image ModalWhat is this? How many times did he put a comb through his hair? (credit:Jo Hale/Getty Images)
Nick Carter(20 of32)
Open Image ModalNick's version of Justin Bieber hair. (credit:Brad Barket/Getty Images)
Nick Carter(21 of32)
Open Image ModalWhy does Nick's hair look so greasy? Gross. (credit:Ethan Miller/Getty Images)
Howie D(22 of32)
Open Image ModalThank God he finally chopped off his hair. Improvement! (credit:Stephen Lovekin/Getty Images)
Nick Carter(23 of32)
Open Image ModalUgh, we're so glad no one wears their hair like this anymore. Right?? (credit:Stephen Lovekin/Getty Images)
Brian Littrell (24 of32)
Open Image ModalWake us up with Brian does something different. (credit: Jason Merritt/Getty Images for DCP)
Nick Carter(25 of32)
Open Image ModalWindswept hair! This 'do must have taken Nick ages to create. (credit:Frazer Harrison/Getty Images)
Kevin Richardson (26 of32)
Open Image ModalThe fancy trucker look, courtesy of Kevin Richardson, esquire. (credit:Jason Merritt/Getty Images)
AJ McLean(27 of32)
Open Image ModalParty on the face! (credit:STR/AFP/Getty Images)
Nick Carter(28 of32)
Open Image ModalWelcome to the 21st century, Nick! (credit:AP Photo/Charles Sykes, file)
Brian Littrell (29 of32)
Open Image ModalOMG, Brian dyed his hair! He's just as surprised as we are! (credit:Stephen Lovekin/Getty Images)
Nick Carter(30 of32)
Open Image ModalIt's like Nick attempted a fauxhawk and failed. (credit:Jason Merritt/Getty Images)
AJ McLean(31 of32)
Open Image ModalAJ stole the rest of Kevin's goatee. (credit:Jason Merritt/Getty Images)
Howie D(32 of32)
Open Image ModalHowie is tired. Therefore regular hair these days. (credit:Getty Images)