Sienna Miller in a VOGUE interview: "Beauty is really the least interesting part of a person"

Oh dear, how did you save that?

Ketchup. No joke. I called salons, and they all told me it was the only thing that evened out the green. I used it like a hair mask. Multiple times. What remained was a very ashy blonde.

You've tried so many hairstyles and hair colors. Is there anything you'd like to try again with your hair?

I'd like to see what I'd look like with black hair. That would be quite a drastic change. I'm naturally a very blonde, summery type, and I have this boho look. But I think I'd enjoy the change, especially if it were for a role.

Speaking of makeovers, you've gone through quite a few for your roles. Which hairstyle was the best?

Edie Sedgwick's in "Factory Girl." I wish I could cut my hair that short again.

And which ones do you never want to have again?

Hmm, I think it's from my role as the chef in "Burnt." Nobody asked me to, but I thought I needed a completely avant-garde hairstyle for it. So I got micro bangs and an undercut at the nape of my neck. It was the worst haircut. And it grew out horribly. (laughs)

Speaking of growing out: Does a root bother you?

Not really. I think it often makes the look more casual, especially with blonde hair. I always try to put off coloring as long as possible. If it ever gets on my nerves, I use mascara. And what always helps is tying my hair up. I find the roots are less noticeable then than with loose hair at the parting. I like sleek braids the most. They also give me a bit of a facelift.

Would you be open to a real one?

Do I want to have the skin I had when I was 20? Yes, probably. But I value aging, wisdom, and living a life well lived. Many of the women I know look more beautiful today than they did before. They've simply always taken good care of their skin. Whereas fillers and surgery often project a form of insecurity onto the face. I want to look up to women who are older. Like I admire Charlotte Rampling, for example. She's never done anything to her face. And I find that so beautiful to see. Who knows, maybe in 20 years I'll be sitting here with a totally toned face. But I'd like to be like Charlotte Rampling. We'll see if I can do it.

Excuse me for asking so directly: But don't you do anything? Your skin looks so good...