My fianc and I are haveing a small destination wedding. 2 people who were not invited have already booked their flight and hotel for our wedding. They found out our wedding information from a family member who was invited. We had a small guest list for two reasons, first we wanted it to be our closest family and friends and second we simply cannot afford a big wedding. What do I do at this point since they have already paid and how do I prevent other people who are not on the guest list from attending?