While I think most celebrities probably don't have any hang ups, I also think that most of them who say "Yeah I walk around the house nude" say it mostly to generate tabloid fodder and get their fans to imagine it. I strongly doubt that it's sincere, let alone has anything to do with a nude lifestyle.
When some celebrity announces that they go to a known nudist venue, endorses public/social nudity, and/or uses the word "nudist" or "naturist" to describe themselves, then I'll say there's a celebrity nudist. Till then, I don't think there are any.