Kensington Palace today announced the due date of Kate Middleton: Let the countdown begin.“Their Royal Highnesses The Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in April 2015,” this morning’s statement from the royal office read. April will be a busy month. The couple will celebrate their fourth wedding anniversary on April 29 and Queen Elizabeth will turn 89 next April 21.The couple’s son, Prince George, born July 22, 2013 and will be 21 months old by then. The palace statement continued: “The Duchess of Cambridge continues to be affected by Hyperemesis Gravidarum, but her condition is steadily improving.”