Harry, Niall, Zayn, Liam and Louis-better known as One Direction-have taken the world by storm. From their third place finish on Britain's X-Factor, to the top of the charts with their debut album, Up All Night, these handsome young men have quickly achieved the overwhelming popularity of their iconic predecessors, The Beatles. Find out who's a prankster, who's a bad boy, and who's a ladies man as All for One goes behind the scenes of One Direction's everyday lives. Join their childhood friends, fellow boy bands-Big Time Rush, Mindless Behavior and Westlife-and X-Factor contestants as they share their favorite memories from this sizzling act's rise to fame.