From left, Usher, Shakira, Adam Levine, and Blake Shelton arrive at "The 

From left, Usher, Shakira, Adam Levine, and Blake Shelton arrive at "The Voice" season 4 red carpet event at the House of Blues on Wednesday, May 8, 2013 in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Associated Press
From left, Usher, Shakira, Adam Levine, and Blake Shelton arrive at "The Voice" season 4 red carpet event at the House of Blues on Wednesday, May 8, 2013 in Los Angeles. (Photo by Matt Sayles/Invision/AP)
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