Getting into character: Olivia played a rebel on The OC with tattoos and purple highlighted hair (pictured), but off-screen, she opted for a more laid-back look

Happy Birthday Olivia Wilde! See the star's beauty evolution

In honor of Olivia Wilde's birthday, FEMAIL charts the actress' beauty evolution from beachy, blonde guest star on The OC to glamorous cool girl, Revlon spokesmodel and star of HBO's drama Vinyl.

Pin for Later: 29 Ways The O.C. Shaped Our Teens The Vests Yep, Olivia Wilde right there — rocking a jeans mini and punk hairdo.

The Vests

Pin for Later: 29 Ways The O. Shaped Our Teens The Vests Yep, Olivia Wilde right there — rocking a jeans mini and punk hairdo.

10 things that single people are tired of hearing.

10 Things Single People are Tired of Hearing.

Olivia Wilde is a great actress -- look at the emotional range above! Olivia Wilde reaction gifs make Conan O'Brien shake. Sometimes Olivia Wilde is NSFW and sometimes she's on the line.

Olivia Wilde. Rachel Bilson

Adam Brody Rates O. Makeout Partners Rachel Bilson and Olivia Wilde

Olivia Wilde <3

Discover the world of Anna Beck. Inspired by travel and handmade in Bali, Anna Beck jewelry is collected and loved for its handmade quality and unique signature style.

PEOPLE did a slideshow of celebs who starred in The OC, like Olivia Wilde and Chris Pratt. My favorite is the clip of tiny Shailene Woodley from the pilot. Who was your all-time best and worst guest star?

The O.C. 10th Anniversary: Olivia Wilde, Nikki Reed, Chris Pratt

PEOPLE did a slideshow of celebs who starred in The OC, like Olivia Wilde and Chris Pratt. My favorite is the clip of tiny Shailene Woodley from the pilot. Who was your all-time best and worst guest star?

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