This week was all about belted waists and interesting details. Michelle Williams stunned in a Dior number with a very plunging neckline. Rachel Bilson gave us a fun collar on a classic silhouette in Preen. Rachel's Hart of Dixie co-star Jaime King won the pretty contest in this lovely Jason Wu frock. Evan Rachel Wood also rocked Preen, but in her own way. And Nicole Richie kept it casual with those Isabel Marant jeans that seemed to be all over Paris.