Sienna Miller admits she's a "spiteful little sh*t". The actress says she revels in breaking society's rules. "Life's really short," she tells US magazine 'Nylon'. "A lot of what we do is a reaction to what people think you're supposed to do - 'Have a kid at 30. Move in, but live together for at least this amount of time.' "All of those rules I want to rebel against. Because I'm a spiteful little sh*t, basically." The 32-year-old told the magazine that she moved in with actor fiance Tom Sturridge, the father of her baby daughter Marlowe, "after two weeks" of dating. The 'Layer Cake' star also says she felt "let down" after giving evidence in the phone hacking trial in the UK. "I feel very let down by that system, but there is a more important thing going on: this conversation about hacking people's phones and privacy. "I'm really proud of the things I've done standing up for myself in that way," she tells the April 2014 issue, out now. "But it doesn't make it easy that suddenly Jude [Law] and I are back on the cover of every newspaper in London." Pictured: Sienna Miller Splash News and Picture Agency does not claim any Copyright or License in the attached material. Any downloading fees charged by Splash are for Splash's services only, and do not, nor are they intended to, convey to the user any Copyright or License in the material. By publishing this material , the user expressly agrees to indemnify and to hold Splash harmless from any claims, demands, or causes of action arising out of or connected in any way with user's publication of the material.