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Jennifer Aniston

NEW YORK - MARCH 15: Jennifer Aniston visits "Late Show With David Letterman" at the Ed Sullivan Theater on March 15, 2010 in New York City. (Photo by Marcel Thomas/FilmMagic)

Jennifer Aniston's Hair Transformation

Jennifer Aniston's classy style is sometimes described as predictable, but she's much more experimental when it comes to her tresses than she is with her wardrobe. In honor of the actress' 44th birthday on February 11th, take a look back at the many hairdos — and a few hair don'ts! — that she's sported over the years.