Photographs of the 24-year-old have surfaced on website Celeb Jihad – which leaked naked images of actress Amanda Seyfried last month.
Several images show Miley naked in a sauna, while other photographs see the We Can’t Stop singer in underwear.
Miley has yet to speak out on the image leak.
The former Disney star has recently toned down her wild child image to work with her charity, the Happy Hippie Foundation, which supports homeless youth and the LGBTQ community.
After leaving Hannah Montana, Miley reinvented herself into one of pop’s most shocking stars, regularly posing topless on stage and discussing her sexuality.
However, while the star has posed naked before, the images circulating online at the moment have been released without her consent.
Miley, who is engaged to Liam Hemsworth, is the latest female star to be targeted in the hack.
Topless images of Demi Lovato were leaked online, while photographs of Emma Watson at a costume fitting were stolen, although her rep confirmed that they were not naked or topless images.
This worrying hack mirrors that of “The Fappening”, as it became known, in 2014.
Jennifer Lawrence, Kirsten Dunst and Kate Upton were among the stars hit by the hack, with images and videos obtained via an iCloud breach.
A 36-year-old man named Ryan Collins was jailed for 18 months for his role in the hack.
Jennifer Lawrence, who saw numerous naked pictures leak online, called the incident a “sex crime”, and said those who searched for the images should be ashamed.
By Emma Kelly