Most Dramatic Celebrity Hair Makeovers

Miley Cyrus's hair has had a very busy year. After experimenting with the ombre hair trend in the spring, she revealed a solid blond pixie in August, and then went for an even shorter style in November.

Try on Miley Cyrus's many hairstyles now!

The third time's the charm for Elisabeth Moss, who went from brunette, to blond, and back to brown again.

Mowry chopped her hair into a pixie in October, a look inspired by her son, Cree. “amp#91;The birth ofamp#93; my son has given me a whole new perspective and outlook on life," she told InStyle.com "I’m not the same person I was before. Hair comes with a lot of experiences and emotions: It’s out with the old and in with the new.” We agree!

Despite her fun, spontaneous nature, Rihanna's pixie crop wasn't a spur-of-the-moment decision. "We’ve been talking about going short for a little while now, and we actually planned to cut it the following week," said the star's hairstylist Ursula Stephen. "I just felt like-why wait... Rihanna was ready for her short hair again."

See Rihanna's edgy hairstyles-on you.

Hough chopped her long layers into a chin-skimming bob in June, but she's tempted to make even more hair changes. "I keep going shorter, it's like the curse of the short hair syndrome," Hough told InStyle. "My friend has a pixie cut, and I've been wanting to do her style. I probably won't do that, but I want to!"

Sample Julianne Hough's cute hairstyles.

Theron made quite a buzz when she went for a completely-shorn hairstyle in June. The change was for her role as Furiosa in the post-apocalyptic film Mad Max: Fury Road. "Charlize takes her trade very seriously. She’s not afraid to put herself out there and transform into the character she’s playing," said Theron's stylist Leslie Fremar. "And let's be honest, she's so beautiful!"

Try on Charlize Theron's hair!

Celebrities were loving pixie cuts in 2012, and we may have Anne Hathaway to thank for that! The actress made the severe change in April to play the role of Fantine in the film adaptation of Les Miserables.

See yourself in Anne Hathaway's hairstyles now!

April marked a very regal hair change for Princess Charlene, who cut her shoulder-length waves into a short, polished style.

She may love whipping her hair back and forth as her 2010 single suggests, but when Willow Smith opts to change up her strands, she means business! The pop sensation shaved her long locks in February and went for a day-glo green color the very next month.

Fanning's new brown hue, created by Warren-Tricomi colorist Jenda Alcorn in October, was influenced by her role in the upcoming film Night Moves, where she’ll star alongside Jesse Eisenberg and Peter Sarsgaard.

Try on Dakota Fanning's trademark blond strands!

The arrival of fall marked Portman's change from a warm brunette to a blond bombshell! "She needed to go blond for an upcoming movie role,” her colorist Tracey Cunningham told InStyle.com exclusively. “I used Redken’s Blonde Dimensions which gave her hair a beautiful, multi-dimensional, golden honey color. She makes a gorgeous blond!”

See Natalie Portman's hairstyles on you-from Black Swan and beyond.

We're obsessed with the singer's perfect, mermaid-esque waves, and in September, Del Rey swapped her cinnamon strands for a darker fall hue.

See Lana Del Rey's retro waves on yourself.

Despite her hair-raising wigs in technicolor hues, we found Lady Gaga's decision to go back to her brunette roots in August to be her most surprising style yet. She dubbed the color "Louis Vuitton brown," and we wouldn't expect anything less from Mother Monster!

Try on Lady Gaga's many hairstyles!

Just in time for summer, Clarkson lightened her dark brown strands to a golden blond shade in June.

Love Kelly Clarkson's hair? Try it on!

Welcome to the dark side, Mary-Kate Olsen! The star went for an inky brunette color over the summer.

See yourself in Mary-Kate Olsen's hair.

She's gone red, blond, and blue! Color chameleon Jaime King wore an edgy blue dip-dye in March, which she later traded for a spicy auburn shade.

Try on Jaime King's versatile strands!