"Their Royal Highnesses the Duke and Duchess of Cambridge are very pleased to announce that the Duchess of Cambridge is expecting a baby," St. James's Palace said in a statement. "The queen, the Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall, Prince Harry and members of both families are delighted with the news.
On Monday, "The duchess was admitted … to King Edward VII Hospital in Central London with Hyperemesis gravidarum," the statement continued. "As the pregnancy is in its very early stages, Her Royal Highness is expected to stay in hospital for several days and will require a period of rest thereafter."
As the first born to William -- who is second in line to the throne after his father, Prince Charles -- the couple's first child stands an excellent chance of one day becoming a monarch.