- Children with Princess Caroline of Monaco: Andrea Albert Pierre (b. 8 June 1984), Charlotte Marie Pomeline (b. 3 August 1986) and Pierre Rainier Stefano (b. 5 September 1987).
- Was the son-in-law of Grace Kelly and Prince Rainier of Monaco.
- Was the brother-in-law of Prince Albert of Monaco (b.1958) and Princess Stéphanie of Monaco (b.1965).
- Son of Fernanda and Giancarlo Casiraghi.
- Was brother of Marco Casiraghi, Daniele Casiraghi and Rosalba Casiraghi, married to Massimo Bianchi.
- Was boyfriend of actress Dalila Di Lazzaro, seven years older than him.
- Was boyfriend of Marina Perzy, five years older than him.
- Was three years younger than his wife Princess Caroline of Monaco.
- Was good friends with Karl Lagerfeld, Inès de la Fressange, Marco Balestri, Antonio Varenna, Hélène Boitel and Marina Palma.
- The godparents of his son Andrea are Marco Casiraghi (Stefano'older brother) and Princess Stéphanie of Monaco (younger sister of Princess Caroline of Monaco).
- The godparents of his daughter Charlotte are Albina de Boisrouvray - best friend of Princess Caroline of Monaco - and his brother-in-law Massimo Bianchi (husband of his younger sister Rosalba Casiraghi).
- The godparents of his son Pierre are his sister-in-law Laura Casiraghi (wife of his younger brother Daniele Casiraghi) and Prince Albert of Monaco (younger brother of Pricess Caroline of Monaco).
- He's buried in the Chapelle de la Paix, Monaco.
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