Pregnant actress Sienna Miller and her sister Savannah are leaving the namesake fashion house they helped set up six years ago.

The siblings were co-creative directors of Twenty8Twelve by S. Miller. The company will continue as Twenty8Twelve London.

A statement released on Wednesday by the Miller sisters reads, "We've had a brilliant six years at Twenty8Twelve and are now looking forward to new pastures. We wish the brand the best of luck for the future."

Company managing director Nish Soneji tells WWD.com that the fashions Miller and her sister dreamed up will form the ongoing style for the firm: "We've had a great partnership with the Miller sisters. That vision, along with the uniquely British style the collection has become known for, will continue under the direction of the Twenty8Twelve design team."