The 41-year-old Australian singer-songwriter has introduced Ziegler, a 15-year-old dance prodigy, in six of her music videos, and the dancer has just accompanied the elusive musician on her tour of Australia and New Zealand
Ziegler acts as the face of the star, his conduit of emotion on stage and on the screen, since Sia – who has said he does not want to be famous – prefers to cover his face with a wig when acting.
Sia has said that she asks herself "often" if it is right to work with Ziegler, and that she checks with her "weekly on whether she wants this, and assures her if she ever wants me to stop."
added, on Twitter: "It's a conversation we should all have, not just me, but all the directors, parents and agents with their children, clients and positions."
Responding to an article in The Guardian that questioned whether it was right to put Ziegler in the spotlight while moving away from him, Sia said: "Maddie was already famous when I discovered her, but I have certainly expanded her exposure and I feel responsible for that. "
This article raises a question that I have asked myself often. I do check with Maddie weekly about whether she wants this, and I assure her if she ever wants me to stop stopping. It's a conversation we should all have. Not only me, but all directors, stage parents and agents.
̵1; sia (@Sia) December 6, 2017
With their children, clients, positions. Maddie was already famous when I discovered her, but I have certainly expanded her exposure and I feel responsible for that. I feel very protective of her and my goal is to train her in the choices she makes. Some argue that a teenager
– sia (@Sia) December 6, 2017
You can not or should not be given the option of making sensible decisions for themselves, so I try to choose the best for her always. But I think this is an important conversation https://t.co/0k6bQ8EsvT
-sia (@Sia) December 6, 2017
What I learned from Maddie is that fame affects her in a way different to how it affected me. I can only trust that she is telling me the truth. If that changes, we stop.
– sia (@Sia) December 6, 2017
"I feel very protective of her and my goal is to train her in whatever choice she makes, some would argue that a teenager can not or should not be accused to make wise decisions for himself, so I always try to choose the best for her.
"But I think this is an important conversation."
Sia continued: "What I learned from Maddie is that fame it affects it differently from how it affected me.
"I can only trust that she is telling me the truth, if that changes, we will stop."
Ziegler rose to fame in the US reality television series Dance Moms in 2011, and it was this program that caught Sia's attention and motivated her to use the then 11-year-old in her music 2014 video for Chandelier .
Since then, Ziegler has appeared in other Sia music videos, including Elastic Heart and Cheap Thrills.
In 2013, Sia said that "if someone besides famous people knew what it was to be a famous person, they would never want to be famous."