Designers and sisters Savannah Miller (left) and Sienna Miller during a rehearsal for their Twenty8Twelve spring/summer London Fashion Week show, at the Old Sorting Office in central London Stock Photo - Alamy

Sienna and Savannah Miller design catwalk show - The San Diego Union-Tribune

She Is Inherently Golden”: Savannah Miller On Her Sister Sienna Miller's Style

Sienna and Savannah Miller on Twenty8Twelve and sisters, British Vogue

Nervous Sienna Miller makes London Fashion Week debut as her THREE mums turn up for support

Sienna and Savannah Miller on Twenty8Twelve and sisters, British Vogue

Savannah and Sienna Miller London Fashion Week Spring/Summer 2011 - Twenty8Twelve - Backstage London, England - 18.09.10 Stock Photo - Alamy

Sisters Savannah and Sienna Miller lend style to high street brands, Fashion

Sienna and Savannah Miller launch their new Spring Summer 2011 Twenty8Twelve collection at Selfridges in London Stock Photo - Alamy

Sienna and Savannah Miller design catwalk show - The San Diego Union-Tribune

Miller sisters hi-res stock photography and images - Alamy

She Is Inherently Golden”: Savannah Miller On Her Sister Sienna Miller's Style