Kate Middleton is pregnant with baby number 3

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Kensington Palace said Monday that Prince William and his wife, the Duchess of Cambridge, are expecting their third child.

   The announcement comes as a surprise, as there had been little indication that William's wife, the former Kate Middleton, was pregnant.

   As with her other two pregnancies, the duchess is suffering from Hyperemesis Gravidarum, a form of severe morning sickness, and was forced to cancel her engagements Monday.

   "The queen and members of both families are delighted with the news," the palace said in a statement.

   Kate is being cared for at Kensington Palace.

   William and Kate already have two children, Prince George, 4, and Princess Charlotte, 2.