Singer Sia, who usually hides her face behind an elaborate wig, dared to bare not only her face, but also her breast on social media. Sia's make-up artist, Tonya Brewer, shared a photo of the singer on Instagram, captioning it: "She just directed her first film. She had no idea her b*** was out. Thank you for letting me create magic with you Sia."

Singer Sia. Picture courtesy/Tonya Brewer Instagram account