Sienna Miller left The Royal Haymarket theater last night after the latest performance of her play Flare Path. The actress had an interesting audience member in Jude Law's ex-wife, Sadie Frost, who was there to take in the show. Sienna and Jude first began dating in 2003, the same year as his divorce from Sadie, but they called their on-and-off relationship quits this February. Sienna and Sadie have had a tumultuous relationship. Just last year, Sadie took to Twitter to criticize Sienna for allowing her daughter, Iris, to cut her hair into a pixie cut without asking Sadie's permission first. Now that Sienna and Jude have parted ways, it seems the ladies may have turned over a new leaf. Since the split, Sienna has been striking up a new romance with fellow actor Tom Sturridge. The pair took a romantic trip to Vienna just last week during a break from Sienna's work schedule, and they haven't been afraid to share some PDA when out on the town together. Meanwhile, Jude is living it up on the French Riviera. He's a member of this year's Cannes Film Festival jury and has been enjoying the many parties and premieres taking place during the annual celebration of cinema.