Pauline Grace Maguy Ducruet (4 May 1994; Centre Hospitalier Princesse Grace in Monte Carlo, Monaco) is the daughter of HSH Princess Stéphanie of Monaco and Daniel Ducruet. Her parents subsequently married in a civil ceremony on 1st July 1995.

She has an older brother (Louis) and two half-siblings from her parents' other relationships, a half-brother (Michaël Malbouvier) from a relationship her father previously had with Martine Malbouvier, and a half-sister (Camille Gottlieb).