There are scientific studies proving the merits (and downsides) of every hair color under the sun -- blondes get paid more, brunettes make "better wives," redheads are seen as less attractive, etc.

No one study can objectively prove that one hair color is better than the next. But women who have tried out multiple hues can tell us what their experiences were like. Are you really treated differently when you switch between blonde, brunette and red?

Celebrities are. Olivia Wilde opened up to Into The Gloss about her experiences with hair color, confirming that blonde and brunettes are indeed treated differently in showbiz:

"I spent the first couple years of my career as a very blonde blonde. And then I went brunette for a role, and suddenly all my offers changed -- the types of roles people approached me with totally changed. When I was really blonde, it was always like, ‘The really pretty girl,’ or ‘The sexy hot chick.’ At that point in my career, it was all lame pilots -- those were the types of roles I was going for. And then, when I was on The O.C., it was like, ‘she’s punk-y!’ I had a purple streak in my hair, and I was the ‘punky girl.’ And then when I went brunette, the roles went to more, ‘She’s a waitress with a heart of gold, and a tough life,’ or ‘She’s a doctor.’ And I always wondered -- would I have been offered those roles had I still been blonde? I don’t think so.

I think the perception of brunettes being more intellectual persists. Even though it makes no sense! I mean, Hilary [sic] Clinton is very, very blonde! And when I went from being blonde for a long time to brunette, I felt like I was invisible, because you’d walk into a room, and nobody immediately looks at you. When you’re blonde, it’s like you have a giant highlighter on your head; people can’t help but stare. So, it definitely changes how people think of you."

"I feel like redheads," added Wilde, "are perceived immediately to be kind of sassy and sultry, or at least uniquely… I don’t know, just a little more sassy."

Wilde is not the first celeb to open up about her hair color change. Emma Stone has said that she was only offered certain roles as a blonde as opposed to a wide range of parts after she went brunette. Brittany Snow also said that when she was blonde, people acted differently around her. “There’s a misconception that blondes are a little bit slower," Snow admitted.

But that doesn't stop stars from changing their hair color faster than you can say "dye job." Just this year, we've seen Britney Spears, Sofia Vergara and Ashley Benson hit the dye bottle, not to mention all the stars who've changed their hair for a movie role.

But we haven't had every hair color in the book. Tell us what you think: In your experience, do the stereotypes about blondes, brunettes and redheads still exist? Did you get treated differently when you changed your hair color? Sound off in the comments and read more of Wilde's interview at IntoTheGloss.com.

See stars who've toggled between blonde, brown, red and more:

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  • Anna Kendrick

    June 2013/January 2013

  • Anne Hathaway

    May 2013/February 2013

  • Jessie J

    February 2013/October 2011

  • Reese Witherspoon

    September 2004/February 2013

  • Natalie Portman

    June 2013/August 2012

  • Britney Spears

    December 2012/February 2013

  • Jennifer Lawrence

    September 2012/January 2013

  • Beyoncé

    May 2013/January 2008

  • Agyness Deyn

    May 2012/February 2010

  • Leigh Lezark

    June 2013/December 2012

  • Kim Kardashian

    October 2012/March 2013

  • Lindsay Lohan

    April 2004/May 2012

  • Rihanna

    February 2012/March 2013

  • Kristen Stewart

    September 2007/February 2013

  • Zosia Mamet

    October 2012/March 2013

  • Bonnie Wright

    May 2013/May 2012

  • Olivia Wilde

    April 2012/February 2013 (CORRECTION: A previous version of this slide was incorrectly identified as Olivia Munn.)

  • Emma Stone

    March 2010/January 2013

  • Scarlett Johansson

    March 2009/November 2012

  • Christina Aguilera

    February 2004/November 2012

  • Mischa Barton

    April 2009/February 2012

  • Cheryl Cole

    May 2013/October 2011

  • Emily Blunt

    January 2008/January 2013

  • Victoria Beckham

    September 2007/May 2010

  • Madonna

    April 2003/September 2011

  • Chloe Moretz

    January 2013/February 2013

  • Cameron Diaz

    February 2007/October 2012

  • Lily Allen

    February 2013/June 2008

  • Katy Perry

    December 2011/February 2013

  • Katherine Heigl

    February 2008/June 2010

  • Nicola Roberts

    May 2013/January 2009

  • Jessica Biel

    July 2005/January 2013

  • Leighton Meester

    May 2009/September 2012

  • Christina Ricci

    July 2009/February 2012

  • Brittany Snow

    February 2009/February 2013

  • Ashlee Simpson

    June 2009/February 2013

  • Jennifer Lawrence's Expensive Hunger Games Hair-Dye

    Taking Jennifer Lawrence from blonde to brunette was a pricey process - one involving $30,000 worth of hair, to be precise. Linda Flowers, Head Hair Designer for The Hunger Games, reveals this, the origins of Effie's curls, and the story of Katniss's braid in our Q&A. From finger-curled wigs to Technicolor hues, the movie promises almost as much beauty inspiration as it does drama.

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