“It's an absolute statistical no-brainer that a prenuptial agreement would be highly beneficial in this case,” said divorce lawyer James Stewart from the firm Manches, which handled the multimillion divorce case between Madonna and director Guy Ritchie. Britain's royal family has been plagued by a string of failed marriages. Three of Queen Elizabeth II's four children have been divorced, and William's uncle on his mother's side, Charles Spencer, has two ex-wives.