Actor Sienna Miller follows her drop-dead Mario Testino editorial for Vogue UK with up close and familiar images lensed by Txema Yeste for the October issue of Marie Claire US. Zanna Roberts Rassi styles Sienna in Erdem, Mary Katrantzou, Alexander McQueen, Giambattista Valli and more in ‘Standing Up for Herself and Starting Over: Sienna Miller Enters a Whole New Phase.’