FILE - This June 20, 2012 file photo shows actress Emma Stone at the German premiere of the movie "The Amazing Spider- Man," in Berlin. Stone, Justin Bieber, 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. (AP Photo/Markus Schreiber, file)

Associated Press
FILE - This June 20, 2012 file photo shows actress Emma Stone at the German premiere of the movie "The Amazing Spider- Man," in Berlin. Stone, Justin Bieber, 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. (AP Photo/Markus Schreiber, file)
FILE - This June 20, 2012 file photo shows actress Emma Stone at the German premiere of the movie "The Amazing Spider- Man," in Berlin. Stone, Justin Bieber, 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. (AP Photo/Markus Schreiber, file)
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