The Prime Suspect actress has confessed to being a fan of stripping off in communal situations.
Mirren told the Daily Express: "I am a nudist at heart. I have been on many nudist beaches. It is amazing how quickly feelings of self-consciousness disappear.
"Of course, it only works if everyone else is naked, too."
The Oscar-winner added that she wouldn't turn down further films roles which require her to go naked either.
She said: "I have never said 'never again' to nudity and I am not going to."