Shop Celebrity Style: London Fashion Week has officially begun and Twenty8Twelve is one of the first out of the gate. Sienna Miller, along with sister, Savannah, presented their collection which was inspired by a Joni Mitchell album. Sienna walked the runway in a t-shirt and acid wash jeans by Twenty8Twelve paired with Jimmy Choo studded wedges and a 1930's style wristwatch from Cobra & Bellamy (which is available to purchase from the Twenty8Twelve Westbourne Grove store).