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Actress Sienna Miller in Balenciaga (R) and her sister Savannah (L) are the best of friends at last night’s UK Premiere of Factory Girl at Vue West End in London. There is no sibling rivary between these two, the Miller sisters are launching their own clothing line Twenty8Twelve, which Savannah wore to the event. The name signifies Sienna’s birthdate, December 28. Savannah is a graduate of London’s Central Saint Martins and has worked for Alexander McQueen. With Sienna’s devil-may-care personal style and Savannah’s solid fashion credentials this is sure to be line to watch.