(Getty) Savannah and Sienna Miller (Getty)
may have just endured a potentially painful breakup, but she's certainly not shying away from the spotlight. On Monday, the longtime It Girl 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 cute in a gray sweater, blue shorts and black stockings.
Sienna is currently starring in a London production of Flare Path
, a 1942 play by Terence Rattigan. Meanwhile, Sienna's ex-fiancé Jude Law has been spotted hanging out
with another very fashionable lady—top model Lily Cole.Browse Sienna Miller's latest looks (click any photo):