Hats off to you, Biebs! Justin Bieber performs at Will Ferrell's charity event This image appears in the gallery:This Week's MUST-SEE Pictures From The World Of Music 28. Hats off to you, Biebs! Justin Bieber performs at Will Ferrell's charity event Picture: Getty 69 images See the full gallery: This Week's MUST-SEE Pictures From The World Of Music