SEATTLE, WA - SEPTEMBER 29: Sia and Maddie Ziegler perform at KeyArena on September 29, 2016 in Seattle, Washington. (Photo by Suzi Pratt/WireImage)
SEATTLE, WA - SEPTEMBER 29: Sia and Maddie Ziegler perform at KeyArena on September 29, 2016 in Seattle, Washington. (Photo by Suzi Pratt/WireImage)