Dutch Prime Minister Rob Jetten greets his fianc, Nicolas Keenan, who plays for Argentina, after the group stage match between Argentina and the Netherlands at the hockey World Cup at Wagener Stadium. (is associated with: Dutch PM cheers on own hockey team against Argentinian partner) Bas Czerwinski/ANP/dpaDutch Prime Minister Rob Jetten first celebrated his nation's 3-1 win over Argentina at the men's Hockey World Cup on home soil on Tuesday and then kissed opposition player and his partner Nicolas Keenan."I'm here to cheer on the Netherlands - and a tiny bit also because of my fianc. Maybe he can score a goal for Argentina, but in the end the Netherlands should get the win," Dutch news agency NOS quoted the centre-left politician as saying before the match in Amstelveen. His partner did not score.Jetten was also in the stands on Sunday to watch the Netherlands' victory against New Zealand (5-1) and Argentina's win over Japan (3-0) - first wearing an Oranje shirt and then switching to Argentina colours.He said he was "no hockey expert" and watches "a bit like a layman," but was now a big fan.The 39-year-old has been head of the Dutch government since February. He is the Netherlands' youngest and first openly gay prime minister.