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, who is thought to be less than 12 weeks pregnant, has been admitted to a London hospital with acute morning sickness and is likely to stay for several days.

The royal baby will be born third in line to the throne, after Prince Charles and Prince William.