-- Sia doesn’t often show her face, but she's showing off a whole lot more on Twitter.
The star said that since there may be a plot to sell nude paparazzi photos of her, she decided to post one of the photos first.
The photo, which appears to be a paparazzi-style photo that may have been taken without her knowledge, features her naked backside.
The last line in her tweet is a reference to her new holiday album, which comes out Nov. 17.
"It's for fun and for privacy," she said about her black-and-white hairpiece. "I've been walking around New York this whole time. I don't need security detail. I don't need anything special. I just walk around and I can do that and that's a real luxury when you're in my industry."