The photo tweeted by the star belongs to the photographer, who is believed to have captured the invasive pictures from a distance without permission.
Sia saved someone a lot of money on Monday night when she posted a nude photo of her ass on Twitter.
The photo, which appears to be taken from several yards away, shows Sia standing on her balcony nude with her backside to the camera likely unaware that someone was taking her picture.
Then again, her face is still unseen in these photos.
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Description: She took matters into her own hands and posted the photo herself.