Louis Robert Paul Ducruet (born 26 November 1992; Centre Hospitalier Princesse Grace in Monte Carlo, Monaco) is the son of Princess Stéphanie of Monaco and Daniel Ducruet, a former Palace bodyguard.

He has a sister, Pauline Ducruet born 1994, a half-brother Michaël from a relationship his father previously had with Martine Malbouvier, and a half-sister Camille. His parents were subsequently married in a civil ceremony on 1 July 1995.

Although he holds no title, he is a grandson of Prince Rainier III and Princess Grace of Monaco, a nephew of Prince Albert II, and is currently 11th in the line of succession to the Monegasque throne.

Louis is a huge fan of soccer and supports his hometeam AS Monaco FC with great enthusiasm. He speaks French and English. He also knows Monaco’s local dialect, the ‘langue Monegasque’, as well as a little German, Italian and Japanese.