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Jennifer Aniston

Jennifer Aniston during "Along Came Polly" - London Premiere at Empire Leicester Square in London, Great Britain. (Photo by Tim Whitby/WireImage)

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.