She says she isn't (taken with a grain of salt). She says she granted an interview with People. It does not look like she posed for the pictures in the other magazines.
People is not known for paying unless it's an exclusive, but maybe they are paying her. I have no idea. People and the Star are not the same type of magazines, IMO. Your mileage may differ, and you may like the Star.
I have no idea what Jon has done. He's coming out smelling like roses, so he doesn't have to say anything, past what he supposedly said to Kate's brother and his wife, who seem to be his spokespeople now (why didn't he put a stop to it himself, if he felt like that instead of going to them, if he even did). In fact, he's better off keeping his mouth shut. For Kate, it apparently doesn't matter what she says, it's her fault, all of it. She obviously made a very poor choice in going out to sell her book (and a poor choice if she cancels and leaves people in the lurch) and leaving their children in the care of their dad. Because she did that, he's had an affair, the children are stuck with nanny after nanny, and never see their mom, all the money is being sucked up by Kate, and the home life is terrible, they never have any friends or family, etc etc. All her fault. An affair is nothing, compared to all she has done. Of course not a one of us knows if any of this is true, but if it is, it must be her fault.