Sienna Miller and her sister Savannah have launched their own fashion line Twenty8Twelve. Sienna has long been a style icon and her sister Savannah has worked as a fashion designer for Alexander McQueen and Mathew Williamson. The name of the new line actually comes from Sienna's birthday - December 28th. Here is a sneak peak at some of the pieces. Most of the collection at this point is black or white and definitely has a british styling to it. Available at Shopbop.