Inspired by her own coveted wardrobe, Sienna Miller’s limited-edition capsule collection with Marks and Spencer taps into the seventies with stylish options designed to be worn for seasons to come. The range has proved incredibly popular with shoppers, who have snapped up the pieces in record time. 

Sienna was spotted at the River Cafe in London celebrating interior designer Kelly Hoppen’s birthday and fashion fans instantly recognised her outfit as part of her Marks and Spencer edit. You…