The Crown Princess is pregnant with a possible heir to the Imperial Throne, nearly eight years after marrying the Crown Prince, the Imperial Household Agency announced Tuesday.

"The Crown Princess is three months pregnant and is in good condition. She is expected to give birth between late November and early December," said Kiyoshi Furukawa, grand master of the Crown Prince's household.

Speaking at a news conference, Furukawa warned the media not to get carried away in reporting the Crown Princess' pregnancy, saying, "Please remain calm."