Does anyone know the policy regarding changing your last name on a passport after you're married? I don't currently have a passport but will be applying for one soon, as we are planning a honeymoon to the carribean or europe. I know I obviously need to apply using my current last name, but once we are married can I change it to my married name? If I can't change it until it's up for renewal, will that cause problems if I go to use it again with a new last name?