These 19 Sets of Famous Sisters Have 1 Thing in Common: Great Style

Who they are: Sienna Miller is an actress best known for her roles in Layer Cake and Factory Girl. Savannah Miller is a Central St. Martins graduate and designer. The two joined forces in 2007 to create their line, Twenty8Twelve, but stepped down from the label in 2012.

Sienna counts designers like Matthew Williamson, Christopher Bailey, and Stella McCartney as close friends and often wears their designs on the red carpet. She can probably be credited with single-handedly bringing the "boho-chic" aesthetic to the general public. Savannah has previously worked for Alexander McQueen.