The actress who was engaged to Jude Law when he cheated with the nanny now says monogamy is "overrated."Sienna Miller tells Rolling Stone that "monogamy is a weird thing" for her. She says it's a hard thing to maintain because we're all "animals." She's still with Law and is hoping they'll have babies. The 24-year-old British actress has been in Pennsylvania shooting the screen adaptation of Michael Chabon's novel "The Mysteries of Pittsburgh." She got into some hot water for comments she made about the city. "Can you believe this is my life?" she told Rolling Stone. "Will you pity...