Born as Pierre Rainier Stefano Casiraghi, Pierre Casiraghi is one of the sons of the princess of Hanover, Caroline, and her husband Stefano. As of 2012, Pierre Casiraghi's net worth is estimated to be around $50 million.

Pierre Casiraghi attended Bocconi University where he finished a degree on International Economics and Management. He uses his degree in Economics to learn more about his father's business. In June 2009, he became the major shareholder of a construction company which his father built in 1984.

While at the university, he was reported to be linked with several women but his longest and most romantic relationship was with Beatrice Borromeo. He is known to play saxophone and is capable of speaking in English, German and Italian.

Pierre Casiraghi is also known to participate in many of his mother's humanitarian activities. In fact, he has accompanied his mother when the latter went to Democratic Republic of Congo, Burundi, and Niger. In behalf of Princess Caroline, he visited South Africa to perform the princess' humanitarian duties.