Hot Holiday Hairstyles -- and How to Wear Them!

Emma Watson: Short Hair Credit: Jason LaVeris/FilmMagic; Jason Kempin/WireImage.com; Ian Gavan/Getty Images

Worn up, down or in between, a new hairstyle can instantly change your image. Ahead of the holiday party season, Us Weekly illustrates -- on Emma Watson, Kerry Washington and Lauren Conrad -- how the same cut can be worn three different ways.

PHOTOS: Celebrity hair must-haves

IF YOU HAVE . . . SHORT HAIR LIKE EMMA WATSONSLICKED BACK: Ooh la la! The Perks of Being a Wallflower star gave her September 10 French twist a dose of rock 'n' roll by loading it with gel.

CHIC CURLS: "The look is feminine," says stylist Rodney Cutler of this September 26 'do. "Sweeping fringe accentuates cheekbones."

SHINY STRAIGHT: She nailed the part! "A ! deep side comb frames the face and softens features," Cutler tells Us of Watson (on September 13).

Kerry Washington: Medium HairCredit: Kevork Djansezian/Getty Images; Gregg DeGuire/WireImage.com; Jason Merritt/Getty Images

IF YOU HAVE . . . MEDIUM-LENGTH HAIR LIKE KERRY WASHINGTONCLASSIC CHIGNON: "Kerry wanted a runway-inspired look," says stylist Kiyah Wright of the Scandal stunner's September 23 undo.

EFFORTLESS UPSWEEP: Not half bad! Washington pulled hair back at the temples October 22 with a crystal-encrusted barrette.

RETRO SPIRALS: Nifty '50s! The star (on August 9) locked her tresses in place with Muze Last Look spray. ($15, kiyahwright.com)

Lauren Conrad: Long HairCredit: John Parra/WireImage.com; Jason LaVeris/FilmMagic (2)

IF YOU HAVE . . . LONG HAIR LIKE LAUREN CONRADTRENDY TOPKNOT: "Unless you're one of the lucky few who wake up with perfect hair," advises Conrad (on September 11), "know how to do a bun."

PLAYFUL PONY: Party trick: "I keep bobby pins tied with an elastic," the author (on October 22) has said. She uses them to tame flyways.

DEMURE WAVES: On October 13, stylist Kristin Ess curled Conrad's hair at eye level to "keep it elegant, not over-the-top sexy," she tells Us.