The group leading the latest charge of boy band mania was actually created by the celebrity panel on the UK's The X Factor. Simon Cowell and former Pussycat Doll member Nicole Scherzinger, who was acting as a guest judge, decided that Harry, Niall, Louis, Liam and Zayn weren't quite strong enough as soloists and pushed them together in...wait for it...One Direction. (You can let out a big "Ohhhh! I get it!") 

Since finishing third in the 2010 season of the singing competition, the band has broken records (including being the first band to having their first three albums debut at No. 1) and headlined massive global tours. No doubt their upcoming album FOUR will further solidify their legacy.—Jeff Benjamin