FILE - This March 28, 2013 file photo shows Canadian singer Justin Bieber performing during the "I Believe Tour " in Munich, southern Germany. Billboard announced Wednesday, April 3, that Bieber, ... more 
FILE - This March 28, 2013 file photo shows Canadian singer Justin Bieber performing during the "I Believe Tour " in Munich, southern Germany. Billboard announced Wednesday, April 3, that Bieber, Taylor Swift, Bruno Mars and R&B singer Miguel will perform at the Billboard Music Awards on May 19 in Las Vegas(AP Photo/Matthias Schrader,File) less 
1 / 30
Associated Press | Photo By Matthias Schrader,File
Wed, Apr 3, 2013 12:32 PM EDT