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

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

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

British actress/designer Sienna Miller and designer Savannah Miller

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

Twenty8twelve fashion collection hi-res stock photography and images - Alamy

Savannah miller hi-res stock photography and images - Alamy

Sienna and savannah miller hi-res stock photography and images - Alamy

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

British actress Sienna Miller and designer Savannah Miller attend their Twenty8Twelve's Autumn/Winter collection catwalk show at London Fashion Week in London on February 22, 2009. (UPI Photo/Rune Hellestad Stock Photo - Alamy

Sienna Miller and her lookalike sister Savannah cut chic figures for clothing launch in London

Sienna Miller London Fashion Week Spring/Summer 2012 - Matthew Williamson held at the Tate Modern - Front Row London, England - 18.09.11 Stock Photo - Alamy

British actress Sienna Miller and designer Savannah Miller attend their Twenty8Twelve's Autumn/Winter collection catwalk show at London Fashion Week in London on February 22, 2009. (UPI Photo/Rune Hellestad Stock Photo - Alamy

Actress Sienna Miller and fashion designer Matthew Williamson arrive at Somerset House for the opening night of a Matthew Williamson exhibition celebrating the October launch of a book dedicated to the of