They didn't. They are dating yes, but not married. Most of the magazines are talking about Edward and Bella getting married in the shooting of Breaking Dawn.. but that doesn't have anything to do with Robert and Kristen. So as far as anyone knows they aren't married.
couldn't give a tiny rat's arse really. i prefer kellan anyhow. it's totally up to rob and kristen wot they do with their lives. no doubt she'll get death threats from sad acts who've got no life as all the celebridades do. it's prob a load of bullshit anyway. the newspapers etc are full of it.