LAS VEGAS, NV - SEPTEMBER 23: Sia and Maddie Ziegler perform onstage during the 2016 iHeartRadio Music Festival - Night 1 held at T-Mobile Arena on September 23, 2016 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)
LAS VEGAS, NV - SEPTEMBER 23: Sia and Maddie Ziegler perform onstage during the 2016 iHeartRadio Music Festival - Night 1 held at T-Mobile Arena on September 23, 2016 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)