Prince William dropped a hint about the sex of his unborn child. While watching a soccer match in Birmingham, England on Tuesday, William said, ?I?m going to insist the baby is called Jack." After a pause, the 35-year-old reportedly added: ?Or Jackie.? He was apparently referring to outfielder Jack Grealish. Prince William and Duchess Kate are parents of 4-year-old Prince George and 2-year-old Charlotte. They will welcome baby #3 this month.