Yet the enormous influence wealth of both their families – Tatiana is from a billionaire Colombian dynasty – means there is an unprecedented level of interest in the nuptials.
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Here HELLO! offers you ten facts abouts this intriguing royal.
•Andrea Albert Casiraghi is the son of Princess Caroline and Italian businessman Stefano Casiraghi. He is named for a friend of his father's who died a few years before his birth on June 8, 1984 and his maternal uncle.
•Sadly, his father Stefano died himself in a speed boat crash in 1990, aged only 30.
•After the tragic accident Andrea grew up on his family's French country estate in St Remy de Provence, along with his siblings Charlotte and Pierre. This simple upbringing was a far cry from the glamour of Monaco where his grandfather Rainier reigned.
Andrea Casiraghi pictured with mum Caroline, siblings Charlotte, Pierre and Alexandra and aunt Caroline
•Andrea is fluent in French, Italian, English and German.
•In 1999 the young royal was named amongst the 50 Most Beautiful People in the world.
•He is the grandson of Princess Grace, former screen actress Grace Kelly.
Princess Grace of Monaco pictured with husband Rainier
•His education took place at the International School of Paris, the American University in Paris, where he earned a degreee in international politics, McGill University in Montreal. The royal received a master from The New School in New York in international affairs.
•His first child, born March 21, 2013, is named Sacha.
•His stepfather is Prince Ernst of Hanover, who is the father of his half-sister Princess Alexandra of Hanover.
•Andrea is a keen horserider, skier, footballer and long distance runner.