Sebbene Maria Adelaide fosse molto innamorata di suo cugino Orléans, Luigi XV mise in guardia Penthièvre contro un tale matrimonio a causa della reputazione della giovane duca di Chartres come libertino. ###>Although Marie-Adélaîde was much in love with her Orléans cousin, Louis XV warned Penthièvre against such a marriage because of the reputation of the young Duke of Chartres as a libertine.