On Monday, Sienna celebrated the launch of the latest Twenty8Twelve collection at UK retailer Selfridges alongside her sister Savannah, who handles most of the design duties for their fashion label.
Both sisters were outitted entirely in Twenty8Twelve, with Sienna looking particularly gorgeous in a gray sweater, the darker grey shorts (hell no) and black stockings.
Sienna is currently starring in a London production of Flare Path, a 1942 play by Terence Rattigan.
My new crush...