Man power! Us looks back at music's most successful all-male groups, from One Direction to the Backstreet Boys
After nabbing third place on The X Factor's seventh season, Niall Horan, Zayn Malik, Liam Payne, Harry Styles and Louis Tomlinson caught their rising star. Their debut American single "What Makes You Beautiful" went Platinum and their first U.S. tour sold out within hours. The Irish-British fivesome will hit the road again on their first international world tour in 2013.
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