Prince William and his wife, Kate Middleton, are expecting their first child Palace officials have announced.  The sex of the baby is unknown as well as the estimated date of birth, but the baby will probably become monarch since William is second in line to the throne.

Prince William and Kate got married on April 29, 2011 at Westminster Abbey in London.  Over 300 million people from all over the world tuned in to watch their wedding.  See their vows from the wedding below.