Sienna Miller was a splash of color in the NYC night at the premiere of Mysteries of Pittsburgh yesterday. She had her costar Peter Sarsgaard smiling on her arm. Earlier in the day Sienna talked about her upcoming debut on Broadway, saying, "I'm scared obviously but really excited. . . If you want to be an actress you think about opening on Broadway." If she gets nervous she can always turn to her big screen buddy Peter who is a seasoned veteran when it comes to stepping onto the stage.
Images include: Sienna Miller, Peter Sarsgaard, Zoe Kravitz, Rachel Zoe, Maggie Gyllenhaal