I'll come to her defense for once, if her relationship with the Coldplay guy is still as good as she says it is, then that is great for her kids. Even a peaceful divorce is still a challenge to them, but it's the next best thing to the parents staying happily together as a married couple.
And to give her and him some credit: There was zilch dirty laundry washed between them at all when they separated. Just the (ok: somewhat pretentious) announcement and that was it. Whatever the "conscious uncoupling" between them was, it seems to have worked, congrats. Unlike Johnny Depp who all of the sudden turned supposedly wife beater after just a year or so (and had his first wife come up in his defence) or Brad Pitt who went from role model husband to allegedly kids harrassing drunk all of the sudden. Gwyneth might steam her clam and all that, but she is seemingly no Amber or Angelina.
I had a New Year's Eve dinner at my first wife's house (and her significant other who is incidentally my best friend) yesterday, together with my current wife plus the kids (who had cooked for us) from my first marriage and it was a lovely, fun evening, if a little heavy on the alcohol! Infinitely superior to the fleeting gratification you get for dishing it out in a war of roses.