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

Twenty8Twelve by s. miller Takes London Fashion Week

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

Sienna Miller: Twenty8Twelve at London Fashion Week!: Photo 2239912, Savannah Miller, Sienna Miller Photos

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

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

Celebrity sisters Sienna and Savannah Miller pose for their portrait at the launch of their fashion label's latest collection: Twenty8Twelve. London F Stock Photo - Alamy

Jude Law takes pride of place in front row as he supports Sienna Miller at London Fashion Week

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

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

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

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

Sienna Miller: Twenty8Twelve at London Fashion Week!: Photo 2239912, Savannah Miller, Sienna Miller Photos

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

Savannah Miller - Wikipedia

Jude Law takes pride of place in front row as he supports Sienna Miller at London Fashion Week