The royal brothers are up for a little sibling rivalry to add some spice and excitement on the game.
Cousins Billy Vunipola and Taulupe Faletau grew up together playing rugby in their back gardens in Pontypool, South Wales, after their fathers, who played for Tonga, moved there in 2000.
Fantastic Four star Ioan Gruffudd went nuts when Wales secured a famous rugby World Cup triumph over England at Twickenham. Until you find out the brothers were rooting for different teams.
Ahead of the kick-off at Twickenham their positions were very clear, with William dressed in an official Welsh team jacket belting out the Welsh national anthem Hen Wlad Fy Nhadau, while Harry, wearing his white England shirt, joined the hosts in a rousing rendition of God Save The Queen.
William, Kate and Harry attended the opening ceremony of the tournament last week, where Harry gave a speech in his capacity as honorary president of England Rugby 2015, the organising committee staging the contest. A slightly dejected Harry, in his England rugby top, was pictured sporting a less than jubilant expression.
The said sports event was watched by 82,000 rugby fans.
The rugby-mad Prince, who is vice patron of the Rugby Football Union, told the supporters, and millions watching at home: “This evening marks the beginning of a celebration of rugby which I hope will inspire current players, those new to the game and future generations”. And William and Kate’s effort of showing their all out support to Wales paid off when they beat England with a score of 28-25.
Despite a slow start, the Dragons stormed to victory with just minutes left on the clock, much to Prince Harry’s evident dismay. Both William and Kate were grinning and William taking the opportunity to revel on the win while his brother look was seriously disappointed.