No. 4: The Wanted

Boy bands are coming back in a big way, and Bieber has tweeted his support for both the Wanted and One Direction. Bieber’s manager, Scooter Braun, seems to have a particular affection for the Wanted, and it’s not a stretch to think Bieber might collaborate with the ‘Glad You Came’ singers someday. The Wanted are just breaking through in America, but a year ago, they were already huge in Britain, where they opened for The Biebs at his big London O2 concert.