Stella to have baby number 2 as her dad's divorce gets nastier

Stella McCartney is pregnant with her 2nd child. This baby will be a brother or sister to her and husband Alasdhair Willis' 17 month old son Miller. Naturally Sir Paul is thrilled, particularly as he is now embroiled in a bitter divorce with wife Heather. But, what I really want to know is where did it all go wrong? What did Heather do or say to make him so angry that he ended it? And that he is now punishing her by not only taking away all of her staff and security, but now he is threatening to take away her title of Lady Heather Mills McCartney, which she did infact only inherit from his 1st wife Linda.
Apparently Heather didn't see the relationship end coming and one row finished it off with Paul calling time on their marriage. Oh what did she say? I bet it was something awful about Linda, that's the only thing that would have made him this angry after an exchange of words, especially since they have a young daughter. And a degoratory comment about Linda is the kind of subject that a simple sorry wont fix.