Kate Middleton reveals due date as ...
"Their Royal Highnesses The Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in July. The Duchess's condition continues to improve since her stay in hospital last month."
At the beginning of the pregnancy, Kate was hospitalized for acute morning sickness, which is what kind of let the cat out of the bag about the pregnancy in the first place.
A palace source confirms to People that the couple are not expecting twins and that they have no plans to reveal the sex of the baby before he or she is born.