• We'll address the issue of hairstyles that age you twenty years a little later on and stick with the main problem with Cameron Diaz's unflattering short hairstyle: It makes her hair look limp and fine. Celebrity hairstylist Mark Garrison advises, "If your hair won't dry naturally into a complimentary shape or the texture is wrong, you need a cut to reshape it. Textured hair needs anti-frizz product, and fine, thin hair needs weightless product."

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    Photo: © Jason LaVeris/FilmMagic
  • Once upon a time, Jessica Alba fancied herself Marilyn Monroe. As you can see here, however, yellow-blonde hair clashes horribly with Alba's orange-y skin tone. If this describes you, you'll need to "adjust hair tone to compliment your skin tone," Mark Garrison says. But, "have a professional do it!" Pros are trained to spot the color problem.

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    Photo: © George Pimentel/WireImage
  • If you're in between colorings and don't want to own it la Dianna Agron (who is totally working her blonde shaggy bob and brown roots), there are several ways to deal with color grow-out. Mark Garrison recommends styling h air so its not flat to head, wearing a wavy hairstyle or putting hair into an updo. You could also part your hair a different way than usual or try one of the new color wands designed specifically for situations like this.

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    Photo: © Kevin Winter/Getty Images
  • Chanel Iman is totally fierce, but when you look at this picture, all you see is hair product overload. "Most dry, frizzy hair needs a serum, oil or cream. Curly hair works well with a curl product that holds but stays flexible--not drying and crunchy," Garrison says. "Experiment with different amounts to see what works best." If hair becomes clumpy and piece-y, you've used too much product. "Fine hair works best with products that dry thoroughly like mousse, gels, root lifters and hair spray."

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    Photo: © Ray Tamara/Getty Images
  • Abigail Breslin's too-long hair looks dead and uneven at the ends--a surefire indicator that she's overdue for a date with some scissors. If you absolutely can't make it to the hairstylist, Mark Garrison suggests curling scraggly locks with a curling iron or hot rollers. You can also use barrettes, clips, headbands or combs to create stylish looks that draw attention away from a neglected cut.

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    Photo: © Eugene Gologursky/Getty Images for OCRF
  • Suffering from limp lock syndrome like Sandra Bullock? Even if you've got super-fine hair, there are ways to pump up the volume. First, cut your hair to maximize body--your strands don't need additional weight. Have your stylist cut dead ends, but don't thin them out with a razor or texture shears. "Layers done right can add volume on top," Garrison says,"A blunt bottom is also helpful. Finally, avoid greasy, heavy and oily products.

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    Photo: © Jason LaVeris/FilmMagic
  • Don't get us wrong, Amanda Seyfriend is absolutely gorgeous. However, when one has a heart-shaped face like Seyfried and parts one's hair in the middle, it can make one's forehead look, um, overly abundant. People with heart-shaped faces should opt for off-center parts. Square face shapes look best with middle parts; round with side parts (they lengthen the face); and oval face shapes should rock deep side parts, which help shorten the face.

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    Photo: © Lester Cohen/WireImage
  • Stripes are for zebras and tigers, Miley Cyrus. If you want the best of both worlds when it comes to your hair color (i.e. both blonde and brunette), there is a way to make your highlights look natural and sun-kissed. To avoid streaks, "Do highlights from underneath so they don't look stripey on top," Mark Garrison advises. "Make sure the tone of your highlights isn't too high-contrast from your base hair color.

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    Photo: © Dan MacMedan/WireImage
  • Not only does Lea Michele look like Rebecca Black's doppelganger (an honor we're pretty sure she doesn't want) with this dorky middle school hairstyle, the eyebrow-grazing bangs make Michele's square face look much wider than it actually is. Square faces should opt for asymmetrical bangs; heart-shaped faces for razored and side-swept; round faces should go for airy or short bangs to keep the face open; and full bangs balance out oval faces well.

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    Photo: © Jordan Strauss/WireImage
  • Whoa there, Katherine Heigl, when did you become an elderly Senator's wife? If you want to keep starring in rom-coms for our generation, you'd better ditch that 'do--pronto. The best way to fix this sitch is to "Find a modern, current style that flatters your bone structure and works with your natural hair texture. This will always look youthful," Mark Garrison says.

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    Photo: © Jon Furniss/WireImage

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