Sienna Miller left rehersals for her latest stage role, Flare Path, in London last night. The actress has been partying with her sister and hitting the town with gal pals since her split from Jude Law. She's also been enjoying nights out with Tom Sturridge, and has been linked romantically to her West End costar Joe Armstrong. However, Sienna has insisted she's not dating anyone, saying: "I’m single! Poor Joe is like, ‘What’s going on?’ We all find it ridiculous and laughable." After her stint on stage, Sienna's got an interesting film role lined up as a belly-dancing Chicago housewife in Rachid Bouchareb's Just Like a Woman.