Sienna Miller envies her pal and fellow British actress Keira Knightley — because she has managed to keep her private life out of the media. The Factory Girl actress — who starred opposite Knightley in 2007’s The Edge of Love – says she wishes she could avoid attention like the Pirates of The Caribbean star. “I haven’t been as bright in some of the decisions I’ve made,” Sienna said. “Keira’s just a more evolved person. “I feel we live in the kind of culture now where you have to be very smart to navigate the right way, and I just don’t have those smarts. I think with age and time it will change, but I can’t obsess about it.”