She may have her own fan-base of ultra-glam celebrities, but star stylist Rachel Zoe is making no secret of her love of the “free spirit approach” of star designer Sienna Miller‘s ready-to-wear line Twenty8Twelve, created in partnership with her sister Savannah Miller. Zoe had the rare opportunity to interview the designing duo for Interview magazine — and a love of fashion, she learned, was a family affair from the start. “Our mum was very glamorous in a shimmery, ’80s sort of way,” Sienna says. “She had endless dinner parties. It was very Bohemian and inspiring to grow up around creative people in that way.” And when Savannah headed to the esteemed St. Martins design school, Sienna naturally offered input on her sister’s projects. “When we were approached to do the line,” Sienna reveals of the collection’s 2006 launch, “it felt like an organic step to take. It means we get to spend time together, and it’s a lot of fun.” And for her part, interviewer Zoe wouldn’t mind stepping into the sisters’ shoes, telling them, “It would be my dream to form a business with my sister and I envy you both for doing so.” Click here to read Zoe’s full interview with Sienna and Savannah. Then tell us: What do you think of their designs? Would you want to work with your sister?