See the Big Bang Theory star's changing looks through the years.

2002

Gregg DeGuire/WireImage

The actress wore dramatic highlights while promoting her role on 8 Simple Rules.

2003

FITZROY BARRETT / GLOBE PHOTOS INC.

She hit the premiere of Shanghai Knights with a sleek pompadour.

2004

Jean-Paul Aussenard/WireImage

Cuoco wore a quirky updo at the People's Choice Awards.

2006

Jesse Grant/WireImage

The Charmed actress hit the WB All-Star Party working face-framing layers and tapered fringe.

2007

Charley Gallay/Getty Images

Cuoco joined the cast of The Big Bang Theory and wore her platinum hair in a sophisticated chignon.

2008

Michael Germana / Superstar Images / Globe Photos

The star wore a sleek center part and shimmery pale eye makeup at the Genesis Awards.

2009

Gregg DeGuire/PictureGroup

She added dimension to her blond layers with a deep auburn under-layer.

2011

ROBYN BECK/AFP/Getty Images

For the Golden Globes, the presenter sported an ultra-long wavy ponytail.

2011

Jeff Kravitz/FilmMagic

Cuoco played up her light eyes at the Emmys with a smoky shadow and lush lashes.

2012

Picture Perfect / Rex USA

Cuoco channeled Bardot to host the People's Choice Awards-pairing black liner with light lipstick and tousled voluminous locks.

2013

Jon Kopaloff/FilmMagic

The actress sported pretty waves and a half-updo with a center part.

2014

Jesse Grant/Getty

Cuoco wore her short hair in a voluminous pompadour to an ASPCA event.

2015

Jason Merritt/Getty

The actress wore her short pixie cut shaggy while at the premier of The Wedding Ringer.

2016

Jon Kopaloff/FilmMagic

Cuoco wore her hair in a short, wavy lob to the 2016 InStyle And Warner Bros. 73rd Annual Golden Globe Awards Post-Party.

2017

Paul Archuleta/Getty Images

The Big Bang Theory star grew her blonde hair out into a lob, which she styled in loose waves.

ncG1vNJzZmivp6x7qrrSrbClnV6YvK57x5qgq2eTmrmmrtGiq7JlmJa2s7%2FTsqOeq1%2Bgrq2x2GaarqeTpHq0w8Seq6Kmlw%3D%3D