Nicole Kidman is a Warm Spring. She has beautiful delicate peaches & cream skin. Her natural haircolor is Red. Here is a great photo of her looking naturally beautiful.
While there's no denying that Nicole is beautiful no matter what, when she makes her hair too blonde, doesn't wear warm make-up colors and wears this white pale dress, it totally drains the warmth from her. In my opinion, it ages her unnecessarily, too.
Here her hair looks too ashy and black is a particularly unflattering color for her.
Compare this photo to the one above. There's no denying that she looks so much better in this one!