Catherine Charlotte's elder brother was Guy Armand de Gramont, the celebrated Count of Guiche, known for his arrogance and good looks, who was successively the lover of Philippe of France, Duke of Orléans and Princess Henrietta of England, husband and wife.

[1] She fell mutually in love with her cousin, Antonin Nompar, marquis de Puyguilleim, and when her father refused his permission for them to marry, they became lovers all the same.

[1] Catherine Charlotte's family connections fit this description, Louis was impressed by her beauty, and the French monarch gave his consent.

[1] Catherine Charlotte herself was convinced because her lover refused to elope with her, she was older than most noblewomen when they married, and that her marriage would give her a high rank at the French royal court, which she would not have to leave, at least not until her husband became Prince of Monaco.

[1] After marriage, the couple resided in Paris and regularly attended the French court, and Catherine Charlotte continued her relationship with her cousin.

[1] Henrietta regarded Lorraine to be her mortal enemy and was deeply offended by the affair, and successfully asked the king to exile Catherine Charlotte from court.