Biggest Celebrity Hair Makeovers of 2011

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Jennifer Aniston

The actress lopped off several inches of her world-famous hair into a chin-length bob in February.

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Drew Barrymore

When Drew Barrymore decided to ditch her ombre look for a glossy auburn shade, "Drew just felt like trying out red, and it looks great on her -- she loves it!" Tracey Cunningham, Redken Creative Consultant for Color told Us Weekly.

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Khloe Kardashian

"I'm so tired of [my sisters] copying everything I do with my hair, so I wanted to go red -- watch, they’ll be red in two days!" she joked to Us when she debuted her new color in January. (She went back to brunette just nine days later.)

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Lauren Conrad

When the star showed a pic of her with blue-dyed ends on her blog in July, she told Us, "I didn't think anyone would even notice! I felt like such a rebel."

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Scarlett Johansson

Scarlett goes scarlet! In May, the normally blonde, sometimes brunette actress showed off her red hue, which is her second foray into fiery-colored locks. (She also dyed her hair in 2009 for her Iron Man 2 role as The Black Widow.)

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Ali Larter

In October, the blonde star left the Andy Lecompte Salon in West Hollywood with a new bob haircut and several wavy layers.

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Blake Lively

The blonde Gossip Girl star stunned everyone when she arrived in NYC with a radiant red hue. "I'm in a film called Hick and I'm a redhead for it," she told Us Weekly in April.

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Ashley Hebert

The long-haired Bachelorette star debuted her dramatic new look (courtesy of New York City hairstylist Vince Smith) in NYC in September: a shoulder-grazing cut and blunt rounded bangs. She later switched it up again with lighter-hued extensions.

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Brooklyn Decker

In March, the model-turned-actress trusted her tresses with celeb hair pro Ted Gibson, who cut her hair in an above-the-shoulder bob. The star also underwent some highlights and lowlights for added dimension to her shorted 'do.

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Dianna Agron

In May, the Glee star squealed (via Tumblr) "I'm so happy!" when she chopped off her trademark, long blonde locks. Then, in August, she dyed them bright pink. "The pink is for work. Tried to keep it a surprise. So, that is all I will say! Thanks for all the nice comments on it!" she tweeted.

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Kate Bosworth

The actress rocked aqua-dyed ends to a concert in September. "We were both attracted to that faded color look, but because pink had already been done we thought to do a faded blue and make it a little different," Bosworth's stylist Cher Coulter told Us.

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Katherine Heigl

The Grey's Anatomy actress lopped off her long blonde hair into a shaggy, short hairstyle in March.

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Katie Cassidy

The sunny-haired celeb, who told Maxim in 2009 that she didn't think people took her serious as a blonde, got ready for fall by dyeing her hair a rich brunette shade in September.

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Olivia Munn

The actress rang in the new year with a brand-new shoulder-grazing haircut in January.

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Rihanna

The ever-evolving stylish singer stepped out in Hollywood in January with an eye-popping, cherry red afro. The Barbados-born beauty first dyed her hair red in 2010.

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Ryan Gosling

The blonde stud debuted an eye-catching platinum color on the set of his new flick, The Place Beyond the Pines, in July.

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Vanessa Hudgens

For her role in Gimme Shelter, the brunette beauty took a daring risk and chopped off her long locks into a super-short pixie.