After relaxing on the shores of Ibiza, Sienna Miller got back to work in London. The always stylish actress fumbled her bag as the strap broke off on her walk. Bummer - maybe she and her sister can get to work on designing a more sturdy line of purses? First, though, Sienna is getting ready to start filming again and reading over the script for Hippie Hippie Shake. We bet that retro crocheted sweater helped her get into character.