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Celebrities and Their Famous Little Sisters

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Julianne Hough

Derek's younger sister Julianne is a two-time "Dancing With The Stars" champion. In addition to dancing, Julianne is also an accomplished country singer and actress. She is currently dating Ryan Seacrest.

(AP Photo/Matt Sayles)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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