First of all this was for People's Magazine Most Beautiful People -- and it was about her being 33 and being proud of her body. It's not hypocritical - it's about being comfortable in your own skin, no matter what age, how you look (P!nk is not a conventional beauty) and this is what P!nk has always been about.
What the other pop girls do is about using sex to sell or shock or get headlines. There is a difference.