The Duchess of Cambridge is expecting a baby, St James's Palace has announced.
Members of the royal family and the duchess's family, the Middletons, are said to be delighted.
A spokesman said the duchess has been admitted to King Edward VII Hospital in central London with acute morning sickness and is expected to stay for several days.
Catherine and William were married at Westminster Abbey in April 2011.
The duchess was last seen in public on Friday when she visited her old school St Andrew's School in Pangbourne in Berkshire.
The royal baby will be born third in line and in direct succession to the throne.
He or she will one day be head of the armed forces, supreme governor of the Church of England and head of the Commonwealth, and subsequently head of state of 16 countries.