It was a wintery???albeit stylish???day at the Burberry Prorsum show during London Fashion Week, with stars including Rachel Bilson and Kate Bosworth popping in for the inclement-weather-themed runway show. ???Everybody is asking me if it hurts to sit down with the studs, but it doesn???t at all, it???s just very heavy,??? Kate Bosworth told WWD, referring to the Burberry pencil skirt virtually co