prince george butterfly
Kate Middleton and Prince William take Prince George to visit the Sensational Butterflies exhibition at the Natural History Museum in London, in a photo released on his first birthdayReuters

Kate Middleton is pregnant with her second child, the palace has confirmed.

Clarence House said the Duchess of Cambridge is expecting her second child. A statement read: "Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their second child.

"The Queen and members of both families are delighted with the news.

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Prince George and Kate Middleton.Reuters

"As with her first pregnancy, The Duchess is suffering from Hyperemesis Gravidarum [acute morning sickness]. 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."

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.

When pregnant with Prince George, Kate was hospitalised for three days with acute morning sickness at the King Edward VII Hospital.

She gave birth to Prince George at the St Mary's Hospital, London, on 22 July.