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Clarence House has confirmed that Prince William and Kate Middleton are expecting their second child.

A statement on Twitter read: "The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their second child.

[related]"The Queen and members of both families are delighted with the news that Their Royal Highnesses are expecting their second child."

They added on the Prince of Wales' official website: "As with her first pregnancy, The Duchess is suffering from Hyperemesis Gravidarum. Her Royal Highness will no longer accompany The Duke of Cambridge on their planned engagement in Oxford today.

"The Duchess of Cambridge is being treated by doctors at Kensington Palace."

The Royal couple already have son, Prince George, who was born in July 2013.

Congratulations!