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LAS VEGAS, NV - OCTOBER 07: Recording artist Sia (L) and dancer Maddie Ziegler perform during a stop of Sai's Nostalgic for the Present tour at the Mandalay Bay Events Center on October 7, 2016 in Las Vegas, Nevada. (Photo by Bryan Steffy/Getty Images)

LAS VEGAS, NV - OCTOBER 07:  Recording artist Sia (L) and dancer Maddie Ziegler perform during a stop of Sai's Nostalgic for the Present tour at the Mandalay Bay Events Center on October 7, 2016 in Las Vegas, Nevada.  (Photo by Bryan Steffy/Getty Images)