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?''

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!' ''