The engagement took place the next day and the wedding was celebrated on 27 November 1755 in the parish of Saints Innocents, in the greatest secrecy. Beaufranchet's parents remained in the province and send their proxies to the wedding. By the side of Marie-Louise, no family member was present. Her mother was represented by a lawyer of the Parlement called Noël Duval, and none of her sisters was present, perhaps to spare the "mighty Seigneur d'Ayat" a painful confrontation with his humble and scandalous in-laws.