Nicole Kidman says goodbye to light locks. Photo: Elisabetta A. Villa, WireImage | Jason Kempin, Getty Images

As the brand ambassador for OMEGA, Nicole Kidman paid a visit to the NYC boutique yesterday to spread a little good karma.

She donated a signed Constellation timepiece to OMEGA's Ambassador Collection Series of autographed watches, but that wasn't the biggest news.

The A-list actress also signed the cases of 30 additional Constellation timepieces, with proceeds from the sales going to UNIFEM (the United Nations Development Fund for Women), Kidman's charity of choice.

And, then there's the hair.

Kidman, who had gone blonde for a lengthy stretch, returned to her roots as a redhead. We almost forgot how striking the color looks against her creamy, pale skin and bright blue eyes.

A big, huge, definite do. Now if only Lohan would follow...

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Red Hair Flipbook
Nicole Kidman goes back to her roots.

Click on to see Hollywood's most famous redheads.
Jason Kempin, Getty Images

Red Hair Flipbook

    Beverly Hills, September 27, 2009
    A previously blond Jessica Alba switched things up and ran errands in Beverly Hills with this new auburn hair color.

    X17online.com

    England, September 10, 2009
    Heather Mills has given up her platinum Posh/Kate Gosselin 'do for an auburn look. Here, she debuts the new shade at a photo op for an animal rights event.

    PA

    Rumer Willis at the Genlux Magazine's BritWeek Designer Of The Year Fashion Show and Awards
    There's no doubt that Demi Moore's daughter is all grown up! Rumer has been hitting red carpets in bold attire and even bolder locks.

    Jean Baptiste Lacroix, WireImage

    Nicole Kidman on Malibu beach at a VOGUE photoshoot
    Nicole has been wearing her hair blonde for years now, but the actress has made a return to her Tom Cruise era ginger locks. Could there be reconciliation in the future for the two? Maybe.

    Flynet

    Evan Rachel Wood at the 18th Annual Gotham Independent Film Awards
    After two years as Marilyn Manson's lady love Evan Rachel Wood is single again. No doubt trading her dark gothy locks for this beautiful light red is a signal that she's over the shock rocker and the non-stop comparison to his ex-wife Dita Von Teese. Welcome back from the dark side!

    Jemal Countess, WireImage for IFP

    Kate Walsh at the Los Angeles Premiere of Kicking and Screaming
    Walsh's character on Grey's Anatomy was only supposed to appear for five episodes, but she was so popular she ended up with a spin-off series Private Practice. Must've been the hair!

    John Sciulli, WireImage.com

    Julianne Moore at the 61st Annual Cannes Film Festival
    The actress and Revlon spokeswoman rocks this dramatic hair color on red carpets and commercials alike.

    Mike Marsland, WireImage.com

    Cynthia Nixon at an Academy of Arts & Sciences Event
    You may be surprised to learn that one of Hollywood's best-known redheads is naturally blonde!

    Dimitrios Kambouris, WireImage.com

    Amy Adams at the 80th Annual Academy Awards in Los Angeles
    Adams' red mane, styled in loose curls and parted to the side, looks classic and elegant with her jewel-toned dress.

    Chris Pizzello, AP

    Nicole Kidman at the New York Premiere of The Others
    The very lucky Aussie vixen was not only blessed with mile-long legs, but perfect hair color as well.

    Jim Spellman, WireImage.com