For those truly curious about the woman behind the metaphorical (and, sometimes, physical) mask, we've gathered more than 30 photos of Sia's face.
From Sia to Zendaya, see all of the best hair and accessories at the 2015 Grammys.
This is one Grammys collaboration we definitely did NOT see coming: Sia and Kristen Wiig together onstage for 'Chandelier'!
Sia has just unveiled her contribution to the 'Fifty Shades of Grey' soundtrack with an emotional new ballad called 'Salted Wound.'
Sia made her 'Saturday Night Live' debut last night (Jan. 17) where she performed her hits 'Chandelier' and 'Elastic Heart.'
Sia is not surprised that her controversial video for 'Elastic Heart' has elicited "pedophilia cries" -- but she is sorry.
Shia LaBeouf co-stars in Sia's latest video for 'Elastic Heart' and it sure is interesting.
Outrage erupted recently after a passenger on a United Airlines flight tweeted a photo of a pet carrier being left out on the rainy tarmac for a reported 30 minutes, causing singer Sia to take notice.
Eminem just released his empowering 'Guts Over Fear' music video, featuring Sia. Fact: It will give you the courage to go out and conquer the world.
Jacquie Lee covered Sia's 'Chandelier' exclusively for PopCrush -- and it has us picking up our jaws from the floor.