Namgyel, 35, is to welcome an heir along with his wife Queen Jetsun Pema, 25, Kuensel newspaper reported today.
The Bhutanese people joined as a nation to celebrate the 60th birth anniversary of the Fourth Druk Gyalpo, King Jigme Singye Wangchuck at Changlimethang yesterday. It was a national holiday in the country.
"From my side and from Jetsun's side, this is a gift to the Fourth Druk Gyalpo. I am about to be a father. Both, Jetsun and I, are happy," Namgyel said.
"As a son, I feel fortunate to offer prayers for the wellbeing of my father. I take it as a special blessing to also have the opportunity to offer prayers as a father, for my son. Since he will carry forward our future, the Prince will be a son to all Bhutanese as well.
Namgyel became fifth King of Bhutan in 2006 after his father Singye abdicated the throne in his favour.