Usually when we dump our fiancé because he’s been caught cheating with the nanny, we don’t go cheating on him after we’ve gotten back together, but that’s just us. And as you may have noticed, Sienna Miller is not us.

All those saucy British tabs are reporting that while Sienna was making fidelity demands of nanny-humping fiancé Jude Law she was carrying on an affair with her Layer Cake co-star Daniel Craig, a good friend of Jude’s. So the series of events goes like this: Jude Law marries Sadie Frost, spews out a couple of ankle biters, has a couple swingers’ parties, gets divorced; Jude and Sienna fall in love and get engaged, live in beautiful-people bliss; Jude goes off to the States to film a movie, gets lonely, humps nanny; Sienna dresses like a hobo, finds out about Jude’s nanny porking, dumps Jude, cries and cries and cries; Jude begs for forgiveness, swears fidelity, shows wee manhood to photographer to ensure women everywhere stop daydreaming about his humping prowess and give him the chance to keep it in his pants; Sienna may be pregnant, takes Jude back, starts her own schtuping-on-the-side enterprise, gets dumped; Jude calls Sienna a "hypocrite and a conniving bitch"; Sienna denies, denies, denies. This whole thing is getting more complicated than the Dylan/Brenda/Kelly relationship.

See Sienna's cheatin' jooblies at MrSkin.com.