Christina Aguilera Turns 31 and Katie Holmes Turns 33: Their Hair Through the Years (omg!)

Fun celeb fact: In addition to being young moms, Christina Aguilera and Katie Holmes share the same birthday (Dec. 18). On Sunday the singer turns 31 and the actress/designer will be 33.

PHOTOS: SEE CHRISTINA AND KATIE'S HAIR OVER THE YEARS

And while their styles are dramatically different -- Aguilera is known for her super-sexy, over-the-top looks, Holmestypically goes for chic, high-fashion ensembles -- they've both changed up their hair several times in the last decade.

PHOTOS: Biggest celeb hair makeovers of 2011

Click through to see the stars' hair through the years and tell Us which look you like best on each one!

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Source: http://us.rd.yahoo.com/dailynews/rss/entertainment/*http%3A//us.rd.yahoo.com/dailynews/external/omg_rss/rss_omg_en/news_christina_aguilera_turns31_katie_holmes_turns_33_190901787/43929973/*http%3A//omg.yahoo.com/news/christina-aguilera-turns-31-katie-holmes-turns-33-190901787.html

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