I dunno. I think she would be a great ambassador for plastic surgery (if she had it done) because, even though I liked her looks before, they did a great job. She looks beautiful and it looks natural. Joan Rivers was open about her surgery yes.. but IMHO, it looked dreadful. If these other women you mentioned have also gone under the knife, then they too would be great adverts too, because it doesn't look "done up"... they just look longer and/or different. It doesn't look like they've had plastic surgery.
I'm not ashamed to say I've colored my hair. If someone actually asked me I'd tell them. The difference is that these women are not owning up to it when asked.