Demi Lovato was asked by a gynaecologist for an autograph midway through her examination.

The Heart Attack pop star revealed her most "violating" moment was when she had her vagina studied by a women's health doctor who made the untimely request for her signature.

In an interview on New Zealand Radio Station ZM, Demi said: "There have been so many uncomfortable and actually violating moments when like, I've been at the gynaecologist and the doctor's like, "Can I have an autograph for my daughter?"

On being stunned by the request, she described her reaction as: "I'm like, 'f**k you! What the hell is wrong with you?"

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It's not the first awkward fan encounter Demi has had while undergoing an intimate procedure.

The former Camp Rock actress said: "Or I'll get lasered or whatever and someone will be like, "My such and such is a huge fan," and it's like, "Great, you can now tell them you've seen my vagina. Like the whole thing!' "

- Bang! Showbiz