Hillary looks gorgeous with her long brown curls.
Ashlee used to have lighter hair when she was younger.
Ashlee rocks her signature red hair in this photo.
Brad Pitt's facial hair changes his whole look.
Brad opted for some lighter locks a few years ago.
Clay started his career with a shorter cut.
Clay goes for a longer look with this 'do.
Johnny opts for a cleaner, more put together look with this style.
Here Johnny sports his signature messy style.
When Kate first became a public figure, this is the hairstyle she was sporting.
Kate's blonde curls look gorgeous after her recent makeover.
Katherine Heigl channels old Hollywood with her blonde curly bob.
Katherine Heigl is seen here trying out some darker locks.
Kim is known for her dark and exotic look.
For a while, Kim tried out a lighter style.
Here Stewart sports jet black hair.
Recently, Stewart has lightened her hair.
Mischa Barton's a young brunette in this picture.
Barton has also played with lighter colors and bangs.
Nicole Richie looks great as a brunette with bangs.
Richie also looks stunning with a blonde bob.
Pete Wentz is hardly recognizable here.
Wentz looks completely different when he goes clean-shaven.
Rachel McAdams looks absolutely gorgeous as a blonde.
Rachel McAdams often changes her hair from blonde to brunette.
Rihanna is known for frequently trying daring hairstyles.
Rihanna sports a fierce dark bob with this look.
Here Spencer sports a more polished, shaven look.
Spencer Pratt looks different with more facial hair here.
Tori used to wear her hair longer.
Now Tori rocks a bright blonde bob cut.
Here her red ringlets make her look completely different.
Tyra Banks looks stylish with dark hair in this photo.
Victoria Beckham looks great with a blonde pixie cut.
More recently Victoria has rocked a darker look.
Jake looks handsome while sporting a buzz cut.
Jake smiles as he shows off his facial hair.