epa03661194 Canadian singer Justin Bieber performs during a concert at The GelreDome Stadium in Arnhem, The Netherlands, 13 April 2013. EPA/PAUL BERGEN *** Local Caption *** 03661194.jpg
Justin Bieber poses for photos prior to a press conference before a free open-air concert at the Mexico City's main historic plaza, the Zocalo, in June 2012. Alexandre Meneghini / AP Photo
Justin Bieber poses for a portrait in West Hollywood in May 2010. Chris Pizzello / AP Photo
Justin Bieber at New York's Madison Square Garden in August 2010. Evan Agostini /AP Photo
In September 2012 Justin Bieber performed at the MGM Grand Garden Arena in Las Vegas. Steve Spatafore / AP Photo
Justin Bieber performs during the half-time show at the CFL Grey Cup championship American football game between the Toronto Argonauts and the Calgary Stampeders on November 25, 2012, in Toronto. Sean Kilpatrick / AP Photo
Justin Bieber at the launch party for Vevo, a premium music video and entertainment experience, created by Universal Music Group, Sony Music Entertainment and YouTube, in New York, December 2009. Peter Kramer / AP Photo
Floyd Mayweather Jr, centre, poses with, from left, Justin Bieber, Lil' Wayne, 50 Cent and Cuban boxer Yuriyorkis Gamboa after defeating Miguel Cotto for the WBA super welterweight title on May 5, 2012, in Las Vegas. Eric Jamison / AP Photo
Justin Bieber performing during a concert at Bercy arena in Paris in March 2013. Francois Mori / AP Photo
Justin Bieber accepts the award for favorite album - pop/rock for Believe at the 40th Anniversary American Music Awards, in Los Angeles, on November 18, 2012. John Shearer / AP
(From left) US president Barack Obama, and performers Jennifer Hudson, Victoria Justice and Justin Bieber, on stage before singing at the annual Christmas in Washington taping at the National Building Museum in Washington in December 2011. Jacquelyn Marti???
Justin Bieber performs in London in March 2013. Justin Tallis / AFP