NEW YORK (CBSNewYork) — The royal family is about to get bigger.

Prince William and the Duchess of Cambridge, the former Kate Middleton, are expecting their third child, Kensington Palace announced.

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The surprise announcement comes as Kate was forced to cancel public appearances Monday.

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The palace said she suffers from a severe morning sickness like her previous two pregnancies.

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William and Kate have two other children, Prince George who is 4 and 2-year-old Princess Charlotte.