Hitmaker Sia has responded to an apparent attempt by paparazzi to sell naked pictures of her by posting one of them herself on Twitter.
The Australian singer-songwriter is known for being secretive about her life, including what she looks like.
She regularly hides her face under masks and wigs.
Sia tweeted a blurry photo of the back of a naked woman, accompanied by the words: "Save your money, here it is for free."
Sia has had a string of solo hits and has collaborated with the likes of Sean Paul, David Guetta and The Weeknd.
She is also one of the most successful songwriters, having written for Rihanna, Beyonce, Katy Perry and Adele.