Kate Middleton is pregnant.

The most eagerly awaited pregnancy was announced by St. James Palace on behalf of Middleton and her husband Prince William.

The child, whether boy or girl, will eventually be heir to the British throne according to new legislation awaiting final approval.

The duchess was admitted to a central London hospital where she'll spend the next few days getting over severe morning sickness.

Prince William is by his wife's side at the hospital, according to Britain's Press Association. Kate is not yet 12 weeks pregnant, according to a royal source close to the duke and duchess.

The couple decided to go public with the news of the pregnancy after the duchess was admitted to the hospital, according to a palace source.