Christina Aguilera in 1999
Christina Aguilera, who turns 31 this year (Dec. 18), made use of her crimping iron at the Billboard Awards in Los Angeles.
Birthday Girls Katie Holmes and Christina Aguilera: Their Hair Evolutions
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Katie Holmes in 1999
Katie Holmes, who turns 33 this year (Dec. 18), sported straight, shoulder-length locks at the premiere of Go in Hollywood.
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Christina Aguilera in 2001
The statement-making singer worked multi-colored braids at the Grammy Awards in L.A.
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Katie Holmes in 2002
The fresh-faced Dawson's Creek cutie arrived at the Abandon premiere with lightened-up layered locks.
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Christina Aguilera in 2005
The same year the "What a Girl Wants" singer married music executive Jordan Bratman, she arrived at the Vanity Fair Oscar party in a demure pale blue dress and towering updo.
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Katie Holmes in 2005
The year her film, Batman Begins, came out, the actress had glossy curls at an Entertainment Weekly party in NYC.
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Christina Aguilera in 2004
The natural blonde shocked fans when she dyed her hair black for her "Stripped" tour. At a fundraiser in NYC, she paired her raven mane with hot pink makeup.
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Katie Holmes in 2008
Two years after marrying Tom Cruise, Holmes was rocking a sophisticated bob and side-swept bangs at the premiere of Mad Money in Westwood, Calif.
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Christina Aguilera in 2008
The songstress chose a blunt cut with bangs at the Africa Rising Festival in London.
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Katie Holmes in 2009
The mother of Suri, (now 5), wore her hair -- which she was in the process of growing out -- in a wavy style at an Elle tribute event in Beverly Hills.
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Christina Aguilera in 2010
The same year the singer split with her husband Jordan Bratman, she wore her platinum bob in fluffy curls during a performance in NYC.
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Katie Holmes in 2010
The Kennedys actress opted for layered, tousled tresses while announcing the Golden Globe nominations in Beverly Hills.
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Christina Aguilera in 2011
The Burlesque star went for classic Hollywood glam at this year's Golden Globes with retro-inspired, center-parted curls.
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Katie Holmes in 2011
The actress piled her hair in a messy topknot for this year's Emmy Awards, where she was a presenter.
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Christina Aguilera in 2011
While leaving a Los Angeles recording studio, The Voice judge was spotted with extra-long, voluminous crimped strands.
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Katie Holmes in 2011
Her best hairstyle yet! The 33-year-old star worked loose, glossy waves at the 2011 MTV VMAs.
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