We hear about a lot of people who are already married when they have their "wedding" and don't tell anybody, but I think this is the first time I've heard about somebody having a wedding and pretending to get married, but not actually going through with it legally, then or ever.
http://forums.theknot.com/Sites/theknot/Pages/Main.aspx/wedding-boards_invites-paper_addressing-invitations-2