After Twenty8Twelve departure, Savannah Miller working on new line

Actress Sienna Miller has divulged that her sister Savannah is working on a new fashion label, following the announcement earlier this year that the siblings had stepped down as co-creative directors of British label Twenty8Twelve.

Mystery had been surrounding Savannah’s plans after it was revealed in January that she and her film star sister had stepped down to explore "new pastures," although Sienna has now confirmed on behalf of her sister that a solo label is in the works.

"My sister is an amazing designer -- she's working on her new label at the moment," Sienna told Vogue UK April 5.

"In fact she's designing in my attic as we speak. I just can't wait to wear all of the pieces."

There is no word on whether Savannah, who studied at prestigious London design school Central Saint Martins and has previously worked for Alexander McQueen and Matthew Williamson, will be taking a different direction with her new line.

Since Sienna and Savannah launched Twenty8Twelve in 2007, the label became well known for its contemporary cuts blending edginess and femininity. The brand continues without them and will be known as “Twenty8Twelve London” rather than "Twenty8Twelve by s. miller" as of this fall.