****NOTE THIS CONTENT MAY NOT BE SAFE FOR WORK***
Somebody was trying to sell nude pictures of SIA . . . so she beat them to the punch by posting one of them on Twitter that shows her full, naked backside.
She said, quote, "Save your money, here it is for free. Everyday is Christmas!" And she gets bonus points for using that naked backside to hype her new album, which just happens to be called "Everyday is Christmas".