FILE - In this Tuesday March 8, 2011 file photo Britain's Prince William and his fiance Kate Middleton leave City Hall in Belfast, Northern Ireland. British divorce lawyers have words of warning for Prince William: Not all fairy tales have happy endings. The prince is set to wed his longtime love Kate Middleton on April 29, but if history is any guide, divorce lawyers say the heir to the British throne would be well advised to sign a prenuptial agreement. 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. (AP Photo/Peter Morrison)

Photo by: Peter Morrison

FILE - In this Tuesday March 8, 2011 file photo Britain's Prince William and his fiance Kate Middleton leave City Hall in Belfast, Northern Ireland. British divorce lawyers have words of warning for Prince William: Not all fairy tales have happy endings. The prince is set to wed his longtime love Kate Middleton on April 29, but if history is any guide, divorce lawyers say the heir to the British throne would be well advised to sign a prenuptial agreement. 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. (AP Photo/Peter Morrison)