See the star's beauty transformation throughout the years.
1996
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The blond J.J. Pearce High School student abandoned her studies to record a gospel album, Jessica.
2000
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The fresh-faced singer of Sweet Kisses was perky in pigtails. "I think innocence is sexy," she has said.
2001
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She released her album Irresistible-and experimented with lowlights at the American Music Awards.
2001
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The singer made a short-lived switch to eye-matching dark locks.
2003
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The bangs-sporting Simpson starred with then-husband Nick Lachey in MTV reality show Newlyweds.
2004
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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
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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
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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
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"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
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Classic Jessica! The country singer (of Do You Know) launched her Fancy perfume wearing perfectly blended long blond extensions.
2010
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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
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The newly-engaged performer sported bombshell locks at the annual Hot Hollywood Party.
2012
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The Fashion Star host showed off her waiting-for-baby two-tone locks.
2013
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While pregnant with her second child, son Ace Knute, Simpson promoted her maternity line-and platinum blonde locks.
2014
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Simpson keeps her platinum 'do, complementing the look with black eyeliner and dramatic lashes.
2015
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Simpson showed off a mane of loose waves at a preview of The Gleason Project in Venice, Calif.
2016
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The famous blonde opted for a smoky eye and pale pink lip while attending an event in 2016.
2017
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Simpson had lightened up hair at an event in 2017 and contrasted her long wavy strands with heavy black eyeliner and nude lips.
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