Prince William returned to London's King Edward VII hospital to visit his wife, Kate Middleton, overnight. He also stopped by the hospital yesterday, after it was revealed that Kate was being treated there for acute morning sickness. Along with the announcement of her illness, the couple shared the exciting news that they're expanding their family. Kate's pregnancy is already creating speculation about whether she'll give birth to a male or female heir to the throne. Regardless of the sex, though, Prince Harry will move down the line of succession once the child is born.