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Prince William and Kate Middleton, Duke and Duchess of Cambridge, are expecting their first child.

Middleton was admitted to King Edward VII Hospital in London today due to severe morning sickness, ABC News reports.

St. James's Palace released this statement following her visit to the hospital:

"Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting a baby. The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall and Prince Harry and members of both families are delighted with the news."

The couple's baby will be Queen Elizabeth's third great-grandchild.

Image: Duke & Duchess of Cambridge (Prince William and Kate Middleton) leaving Westminster Abbey following their royal wedding. April 29, 2011 London, UK Picture: Paul Smith / Featureflash, via Shutterstock