The royal couple broke the news earlier today after Kate was spotted checking into a London hospital for what a spokesperson has described as an acute case of hypermesis gravidarium -- or, as normal gals call it, morning sickness.

The official statement says, "Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting a baby. 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."

No other details, such as a due date, have been announced.