The controversial image shows Kardashian's body is covered in oil as she exposes her rear - but Cheryl, 31, is not convinced that the images haven't been tampered with, reported Contactmusic.
"I don't think it's real. I'll refrain from judgement because each to their own. But I would never do it. I could never. I could never. I could never," she said.
Despite attracting attention for posting a picture of her own tattooed backside online last year, Cheryl insists she's uncomfortable about stripping off in front of people she barely knows.