Prince William and Kate Middleton Expecting Third Child

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Kate Middleton and Prince William

The Duke and Duchess of Cambridge already have a boy and a girl.

Prince William and Kate Middleton, also known as the Duke and Duchess of Cambridge, are expecting their third child. 

The news was announced by Kensington Palace on Monday in a statement that said Middleton was "suffering from hyperemesis gravidarum," as she had during her previous two pregnancies. 

The couple — who married in 2011 — have two children. Their first, Prince George, was born on July 22, 2013, and their second, Princess Charlotte, was born May 2, 2015.

Kensington Palace didn't reveal when the baby was due, although this and its sex are destined to become hot topics of debate in the British press.