See the star's beauty transformation throughout the years.

1996

The blond J.J. Pearce High School student abandoned her studies to record a gospel album, Jessica.

2000

The fresh-faced singer of Sweet Kisses was perky in pigtails. "I think innocence is sexy," she has said.

2001

She released her album Irresistible-and experimented with lowlights at the American Music Awards.

2001

The singer made a short-lived switch to eye-matching dark locks.

2003

The bangs-sporting Simpson starred with then-husband Nick Lachey in MTV reality show Newlyweds.

2004

For the American Music Awards, the In This Skin singer sported wavy waist-length extensions. Hairstylist Ken Paves called the look: "like Brigitte Bardot, playfully sexy."

2006

The Employee of the Month star debuted a Marilyn-inspired red wig from her HairDo line with Ken Paves. "Jessica's hair adjusts well to different fashions," Paves said.

2006

For the MTV Video Music Awards, Simpson rocked a pared-down bob inspired by a true diva. Said Paves, "I showed her a photo of Faye Dunaway in Bonnie and Clyde before we cut it."

2007

"I'm happy to be a brunette because it kind of reflects who I am," Simpson told Extra. She called her dark locks "a little Raquel Welch."

2008

Classic Jessica! The country singer (of Do You Know) launched her Fancy perfume wearing perfectly blended long blond extensions.

2010

The star explored customs the world over in VH1's The Price of Beauty-and wore her lightened locks straight and past the shoulder.

2011

The newly-engaged performer sported bombshell locks at the annual Hot Hollywood Party.

2012

The Fashion Star host showed off her waiting-for-baby two-tone locks.

2013

While pregnant with her second child, son Ace Knute, Simpson promoted her maternity line-and platinum blonde locks.

2014

Simpson keeps her platinum 'do, complementing the look with black eyeliner and dramatic lashes.

2015

Simpson showed off a mane of loose waves at a preview of The Gleason Project in Venice, Calif.

2016

The famous blonde opted for a smoky eye and pale pink lip while attending an event in 2016.

2017

Simpson had lightened up hair at an event in 2017 and contrasted her long wavy strands with heavy black eyeliner and nude lips.