One of my favorite photography books, one I got as a gift from my mother. I think it's really interesting, and I love these kinds of works by Leibovitz. I'm not that into what she does now, as I find it over-produced, but this book is amazing.
I think this would be an amazing gift for any woman, as it is, in a way, a celebration and study of women. It's truly a beautiful body of work.
You can get this at The Book Depository, or in any bookstore with a good photography section.