LAS VEGAS, NV - SEPTEMBER 21: Entertainers Joan Jett (L) and Ke$ha perform onstage during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. ... more 
LAS VEGAS, NV - SEPTEMBER 21: Entertainers Joan Jett (L) and Ke$ha perform onstage during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for Clear Channel) less 
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Getty Images | Photo By Christopher Polk / Getty Images for Clear Channel
Sun, Sep 22, 2013 4:09 AM EDT