The two are now expecting their first child together but briefly split during a dark period in the pop star's life.
Ziegler, now 15, was 11 when she and Sia started collaborating.
"Someone is apparently trying to sell naked photos of me to my fans. Save your money, here it is for free."
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The artists speak out against Trump's trans military ban.
"Sia’s the funniest and goofiest person I’ve met in my entire life."
She's the greatest.. at monochromatic dressing.