Today

Good Hair, Bad Hair

Jada Pinkett Smith
Please tell us this mullet chop job is for a movie. When Jada's hair is slightly grown out, shiny and sleek, its easy to see why she and her hunky hubby are considered one of Hollywood's most stylish couples.

Steve Granitz, WireImage.com

At her best, Katherine Heigl successfully channels Veronica Lake. But with too much product, her locks are dingy: No self-respecting bridesmaid would ever leave the house with hair that looks like it was inspired by "There's Something About Mary".

Alexandra Wyman, WireImage.com

Christina Aguilera
Only Bo Derek could be a perfect "10" in cornrows. Her new mommy makeover included trading her Dirrty 'do for Marilyn Monroe-inspired platinum blonde waves

WireImage.com

Victoria Beckham
Posh pioneered the blunt bob trend -- and it suits her no-nonsense fashion style perfectly. In this uptight up-do (r.), she looks like she's taking her reputation as an ice queen a little too seriously

Ethan Miller, Getty Images

Paris Hilton
Despite her privileged background, Paris has a hard time pulling off the sophisticated debutante look. A flirty asymmetrical bob works better for L.A.'s biggest party girl

Dimitrios Kambouris, WireImage.com

Katie Holmes
Katie's tousled tresses make her look like she's playing dress-up. Her Posh-inspired bob and bangs are picture perfect Hollywood Wife.

Kevin Mazur, WireImage.com

Mary-Kate Olsen
She's known for her eccentric style, but Mary Kate's Marc Jacobs' headband is less modern fashion icon, more Jane Fonda (circa 1982).
Tousled blonde tresses are better on a 22-year-old, no matter how many millions she's got

Dimitrios Kambouris, WireImage.com

Fergie
Hey, Fergie -- Bret Michaels wants his look back. The star is far more Glamorous when she wears her honey hair wavy and free.


Jeffrey Mayer, WireImage.com

Scarlett Johansson
Scarlett's super-poufy beehive doesn't create much buzz. A more natural style (l.) suits the pretty young star.


Alicia Keys
Hey Alicia -- No One should be using the "Coneheads" for fashion inspiration! Keys' classic beauty shines in her natural curls.

Scott Wintrow, Getty Images