Sienna Miller Debuts Red Hair Because Auburn Is The New Blonde This Fall — PHOTOS

The wave of dramatic hair transformations is still going strong in celebrity land. Sienna Miller debuted red hair in London on Tuesday, following the example of other celebs like Ali Larter and Amy Poehler, who have also crossed over to the ginger side recently. After all, what's a better way to ring in the new season than with a brand new hue? You can't deny that copper-colored locks totally read fall — a lot more than blonde that is, at least IMO.

Who knew the bold crimson color would suit Miller so perfectly? The supermodel is notorious for her signature blonde tresses, so it's pretty surprising she has opted for such a drastic change-up. One thing is for sure, she has never looked better.

The 33-year-old unveiled her newly dyed locks at a launch party for her sister's fashion line, Nine by Savannah Miller. She rocked messy bed-head waves styled with a barely-there makeup look, sticking to the au naturel vibes of her ensemble. She kept her outfit pretty demure as well, sporting black jeans, a long-sleeve gray top, and brown suede mules. Look no further than Sienna Miller for your fall fashion inspiration.

Check out the pretty red hair color.

Gorgeous, isn't it?

Sienna may never have gone ginger before, but she has donned many other hair shades in the past.

1. Strawberry Pink

BEN STANSALL/AFP/Getty Images

This is about as close as she has come to red hair, until now.

2. Golden Blonde

Gareth Cattermole/Getty Images Entertainment/Getty Images

This warm golden hue is one she has sported for as long as we have known her.

3. Ashy Blonde

Stuart Wilson/Getty Images Entertainment/Getty Images

She touched up her blonde mane with some ashy-colored highlights that were totally gorgeous.

4. Honey-Colored

MJ Kim/Getty Images Entertainment/Getty Images

This pretty shade was the perfect segue into brown hair.

5. Light Brown

Paul Ashby/Getty Images Entertainment/Getty Images

Clearly, she can rock any hair color under the sun.

Miller's fiery red 'do is definitely my favorite look on her!