A trenchcoated Rachel McAdams attends the opening night of After Miss Julie, Sienna Miller's Broadway debut, in New York City on Thursday (October 22).
The 30-year-old actress, who also attended the after-party at Escape, wasn't the only celeb to support Sienna in her first night - newlyweds Claire Danes and Hugh Dancy and True Blood's Alexander Skarsgard also sat in the audience.
Rachel's TV trailer for