Remember, you are not obligated to invites guests to accompany your single friends. However, if you should do so, and the couple lives together, you can send one invitation with both of their names on it, just as you would to a married couple. Make sure to send an invitation to the principles in the wedding as well. This includes parents, the clergy member and his or her spouse, your fiancé’s immediate family, the members of your wedding party and their parents.

TIP: Mail an invitation to yourself to let you know which day they will receive their invitations.