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Famous Celebrity Sisters

21 of 22

Sienna and Savannah Miller

Sienna Miller's older sister Savannah isn't quite as famous as the actress, but she has definitely made a name for herself in the fashion world. The 36-year-old, who has worked with both Alexander McQueen and Matthew Williamson, launched an eponymous fashion line in 2012. Sienna, 33, is known for her roles in films such as "G.I. Joe: The Rise of Cobra" and "Factory Girl." —XFINITY Entertainment Staff (Photo by Gareth Cattermole/Getty Images)

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

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