Which look is your favorite? Which one is best for a night out? And which is the most fashionable?
Sienna Miller at the 2007 Golden Globes with a Grecian braided style. The look is easy to replicate with long hair, bobby pins, and patience.
In 2010, Renée Zellweger revealed a sophisticated short cut, a true departure from Bridget Jones.
In 2007, Michelle Williams emerged as a style icon with an ingenue-appropriate pixie cut.
Julianne Moore is a ravishing redhead who knows how to play up her hair color - she wears jewel tones and opts for a classic red lip.
Toned down from her Pretty Woman days, Julia Roberts wears her hair with a soft wave and a hint of strawberry to her blonde.
Golden highlights and tons of body make Jennifer Lopez's mane one of the most enviable on the block.
She's been a hair icon since "The Rachel," but Jennifer Aniston looks better than ever with long, sun-kissed layers and the occasional side-braided style.
Her golden locks have always been gorgeous, but when Gwyneth Paltrow lost her length in favor of a shoulder-grazing bob in 2008, women everywhere followed suit.
Supermodel Gisele Bündchen started a long-hair revolution with her perfect, tousled waves.
Carey Mulligan made her mark in Hollywood with long brown hair in An Education, but she became a fashion darling with a cropped blonde cut.
More celebrity news from Harper's Bazaar:
Kim Kardashian Goes Nude
Supermodels Without Makeup
Celebrity Style Guide
The Best Summer Makeup
Celebrities Talk Body Image
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Reprinted with permission of Hearst Communications, Inc.