Maddie Ziegler Says Fans "assume" Sia is 'my mom'

Maddie Ziegler reveals what happened when Sia once tricked a fan about her identity while at the movies. "It's really funny because not many people know what she [Sia] looks like. And there actually was a time where we went to the movies together and someone came up and was like, "Maddie, do you mind if your mom takes the photo of us?" and Sia was like, "Ya, sure. I'll take it." So people sometimes assume she's my mom or sister. Little do they know, it's Sia. But that's her goal. She achieved it." Air Date: Dec 13, 2018