Prince William and his wife Kate Middleton are expecting their first child, the palace announced today.
"Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting a baby," the palace said in a statement today. "The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall and Prince Harry and members of both families are delighted with the news."
The duchess was admitted to King Edward VII Hospital today in central London with hyperemesis gravidarum, an acute morning sickness which requires supplementary hydration and nutrients, the palace said.
"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," the statement said.
The baby will be the queen's third great-grandchild.
Robert Lacey, author of the definitive book "Majesty" said, "The British public and indeed the whole world will be delighted for the same, it keeps the monarchy going. The royal wedding brought a magic back to the monarchy and people are fascinated by William and Catherine."
The announcement follows relentless public and media speculation about when Prince William and his wife would have an heir. The guessing game began almost immediately after the couple said, "I do."