Sienna Miller developed her sense of style as a "visceral reaction" to being forced to dress the same as her stepsister.
The 44-year-old actress' parents split when she was six years old and her dad Edwin Miller went on to marry Kelly Hoppen, and Sienna sought to start and "assert [her] identity" through her wardrobe to rebel against the interior designer's insistence at buying the same clothes for her as for her own daughter Natasha Corrett, now 41.