The Arthur star also believes her willingness to strip on screen has created an image of her that is unlike her real personality - which is quiet and reserved.
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"In truth, I have a much greater interest in a great nightie than nudity. I am not self-confident about the way I look. I think, at times, I look like the back of a bus. I do not have a great body. Naomi Campbell has a great body. Let's be realistic here."
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Despite having bared her body for several film roles, Mirren insists she is insecure about her figure.
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"I have been on a nudist beach about three times in my life and found it very comforting. It is a natural experience and instantly changes the way you think about nudity and sexuality," the actress said.
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Oscar-winner Helen Mirren says that she has visited nudist beaches 'three times' in her life and has found the experience 'comforting'. The 65-year-old actress said she has visited beaches where visitors strip off naked and thinks being nude in public is very liberating.