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Glee Live! In Concert! At The Mandalay Bay Events Center

LAS VEGAS, NV - MAY 21: (L-R) Actress Dianna Agron and actors Cory Monteith and Mark Salling perform during the kickoff of the Glee Live! In Concert! tour at the Mandalay Bay Events Center May 21, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)