Fresh from a preview performance of “After Miss Julie,” Sienna Miller greeted fans and signed autographs in New York City last night (September 18).

The blonde beauty looked adorable in flats, jeans and black top, and looked very pleased as she had just made her Broadway debut at the American Airlines Theatre.

The play is a new take on August Strindberg’s famous 1888 play about class and relationships, and the 27-year-old stars as flighty aristocrat Miss Julie.

Her performance was praised by theatergoers at the play’s end, one commenting, “It was very interesting seeing Strindberg’s work advanced 100 years. Sienna did a really wonderful job, she was very, very honest and created a really deep character.”