Even more than her fashion sense, the teen starlet turned style icon is known for her dramatic 'dos. Look back at her many cuts and colors through the years.Plus: Read the cover story, see our all of Katie's exclusive photos, and go behind the scenes of the shoot!
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Prim and proper in a Renaissance-inspired updo, Katie paired her delicate tendrils with lace and pearls for a regal look at the 47th Annual Emmy Awards in Pasadena, California.
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Dressed in tandem with the event's namesake, Katie showed up at the New York premiere of Boys and Girls looking girlishly innocent with no-nonsense, natural waves.
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The actress looked chic with a simple over-the-ear bob and basic bangs at the Saturday Night Live after-party in New York.
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Katie looked hot at the Los Angeles premiere of Abandon, proving that honey highlights can heat up the night!
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Showcasing her youth with playful pigtails, braided and banded at the bottom, Katie was caught laughing during the Cinetic Media and John Sloss Party at Zoom in Park City, Utah.
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We almost didn't recognize you, Katie! Bare-faced and blonde, the actress tried out layered two-toned hair at the special New York screening of Phone Booth hosted by Interview.
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Evan Agostini/Getty Images Entertainment
The Dawson's Creek star radiated classic simplicity with a half-up hairstyle at the 60th Anniversary of Seventeen magazine party at the Marquee Chelsea West Theatre in New York.
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All smiles at the VH1 Save the Music concert in New York, the star rocked a sleek look with stick-straight streaks.
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Looking like a rescued Rapunzel alongside her Prince Charming (also known as Tom Cruise), Katie sported lovely, loose curls at the premiere of War of the Worlds at Odeon Leicester Square in London.
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While sitting front row at Giorgio Armani Privé in Los Angeles, Katie looked California chic with shiny, side-swept layers in her classic shade of espresso.
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Showing up to support her hubby, Katie looked lovely in loose, underdone waves at Mentor LA’s Promise Gala in Los Angeles.
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We love Katie's flipped-out, fringed cut for a casual luncheon in Los Angeles.
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She keeps going shorter and shorter! Paired with face-framing bangs, Katie's hair looked pixie-perfect at the Los Angeles premiere of Tropic Thunder.
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The A-lister, perfectly polished and politically correct, posed at the 20th Annual PBS National Memorial Day Concert rehearsals at the U.S. Capitol in Washington, D.C.
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Sporting the "late for class" bed-head look, Katie walked among students in Harvard Square in Cambridge, Massachusetts.
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Katie's glazed chocolate curls were red-carpet ready at the National Movie Awards in London.
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Donning classic mariner stripes, Katie showed up at the New York premiere of The Extra Man with shoulder-length, tousled twists and texturized bangs.