FILE - This Sept. 30, 2012 file photo shows Justin Bieber performing at the MGM Grand Garden Arena in Las Vegas. Bieber, Emma Stone, Tyra Banks and Josh Duhamel are honoring teenagers w

 

              FILE - This Sept. 30, 2012 file photo shows Justin Bieber performing at the MGM Grand Garden Arena in Las Vegas. Bieber, Emma Stone, Tyra Banks and Josh Duhamel are honoring teenagers w
FILE - This Sept. 30, 2012 file photo shows Justin Bieber performing at the MGM Grand Garden Arena in Las Vegas. Bieber, Emma Stone, Tyra Banks and Josh Duhamel are honoring teenagers who give back to their communities. Nickelodeon announced Tuesday, Oct. 30, that each star will pay tribute to a teen volunteer at the fourth annual TeenNick HALO Awards in November. (Photo by Isaac Brekken/Invision/AP)