Hair's the Scoop

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Katy Perry is pretty in pink whilst performing on Friday's "Today Show."

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Kim Kardashian models bold bangs at last night's "Keeping Up with the Kardashians" event in LA.

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From the mismatched texture and color to the placement and length, Bridget Marquardt's hair extensions are, well, a hot mess.

Learn the right way to rock hair extensions with our go-to guide featuring tips and tricks from celebrity stylists.

Vogue

Celebrity stylist Oribe dishes on Halle Berry's bold, retro-inspired bob:

The Inspiration
"Halle had never worn her hair in this type of style, and I was very interested in doing something different. I was inspired by the clothes for the shoot, which had an Art Deco influence. I also referenced the film "The Professional" with Natalie Portman. She was only about 13 at the time, and she had this great little bob that looked so perfect. I wanted Halle’s hair to be very sharp and direct in that same way and not at all bulky. The idea was to get flat, straight hair with soft, movable bangs to create interest."

At the Salon
"If you want to request this style, you can tell your hairdresser you want a shorter bob. The key is that it needs to be tailored to each person, by changing the length of the bangs, for example. The whole style is about simplicity and strength…it’s actually a bit severe in its strength. Anyone can wear this style, and your hairstylist should help you modify it to work with your features and lifestyle."

How to Style
"To get-the-look, first blow-dry hair straight using Oribe Royal Blowout. Next, apply Soft Lacquer Heat Styling Spray to the hair shaft, and use a flat iron all over. Soft Lacquer imparts a beautiful shine and a smooth finish. As a last step, smooth any stray hairs with a flat brush to perfect the look, which has more or less no volume."

What do you think of Halle's latest look?

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Jada Pinkett Smith models a chic, side-swept ponytail (piece) and blunt bangs at the U.K. premiere of her son's new film, "The Karate Kid."

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Stylists at Sally Hershberger LA dish on how devotee Ashley Greene maintains her red-carpet-worthy tresses:

The Cut

After wrapping "Twilight: Eclipse," Ashley decided to grow her hair out and so, in the meantime, stylist Louise Moon gave her instant length with (human hair) extensions that matched her natural texture. Next, her colleague, Guy Riggio, cut the extensions to blend into Ashley's real hair and created a face frame to give her versatility during daily styling and red carpet events. “I wanted a look that could be both elegant and sexy. The finished product is a very chic look that will give her many options during the rest of her 'growing out' phase.”

The Color
Star colorist Negin Zand finished Ashley’s look by giving her a light golden brown base and highlights that are a mix of baby blonde and golden tones. An ideal combination for Ashley's coloring, and for spring/summer.

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Victoria Beckham wears hair extensions whilst on holiday in Cannes.

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Kim Kardashian extends her tresses for Vegas Magazine's 7th anniversary party.

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Unlike the fashions of the film, "Sex and the City 2" star Cynthia Nixon's latest look breaks every rule without the payoff. To avoid a mismatched 'do like Cynthia's, follow these simple rules and remember:

— Always dye your clip-in pieces (including highlights, if applicable) to match your base color
— If your hair texture is fine, opt for multiple, thinly woven pieces
— Invest in human hair

Have any tips/tricks of your own? Do share!

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Paris Hilton tries on one of the season's top trends at the 2010 World Music Awards.