There is nothing more hilarious than a little siblings rivalry but multiple it by 2 to get a full blown aspect for the royal boys.

Today Prince William, Prince Harry and Duchess Catherine of Cambridge attended the Rugby World Cup and the two brothers were pitched against each other. I know what you may be thinking and asking why well Wales and England were playing against each other.

Prince William and Duchess Catherine were rooting for Wales as the Duke of Cambridge is the Vice Patron of the Welsh Rugby club and have live for the first 3 years of their marriage life in Anglesey, Wales.  Whilst Prince Harry, 31, is honorary president of the World Cup and vice-patron of the English Rugby Club.

It all began when the Duke and Duchess arrived dressed in the Welsh jacket and they sang the Welsh anthem in Welsh while Prince Harry wore a white shirt for England.

It all ended with Prince Harry who couldn't hide his disappointment as Prince William celebrated with wife Duchess Catherine after the most incredible of comebacks saw Wales pull-off a stunning 28-25 victory at Twickenham.
Photo Credits: The British Monarchy/Facebook/Getty Images/Wire Image