When Lorelai and Christopher tell Rory that they were married in France they state that they did it in a little church and Lorelai makes a comment that it was performed in French so she is not sure if they are legally married. All marriages in France must first be performed by a French civil authority, often the mayor in a small town, before any religious ceremony can take place. Any marriage that was performed solely by a clergy would not be legal. The common practice in France is to be married at the town hall the day before the church ceremony. Also To be married in France one of the parties to be married must reside in France for at least 40 days immediately preceding the marriage.