British actress Sienna Miller is to make her debut as a designer at the London Fashion Week (LFW) to be held next month.

“We are so excited. We felt ready to be taken to the next level,” thesun.co.uk quoted Sienna, 27, and fashion designer Savannah, 30, from a statement.

Their label, Twenty8Twelve, gets its name from Miller's birthday, which falls on Dec 28.