Dashing blue blood Andrea Casiraghi may be fourth in line for the throne of Monaco - one of the wealthiest countries in the world - but it seems his wife Tatiana Casiraghi ( née Santo Domingo ) has amassed an even greater fortune . Mrs Casiraghi , 31 , who wed her 30-year-old husband in 2013 , just landed herself on Forbes ' 2015 World 's Billionaires list at number 847 , with an estimated net worth of $ 2.2billion , which she largely inherited from her Bavaria beer brewery owner grandfather , Julio Mario Santo Domingo , in 2011 . The socialite couple currently reside in Paris with their son Sasha , who turns two this month , and Mrs Casiraghi is approximately four months pregnant with their second child . Scroll down for video . Power couple : Tatiana Casiraghi , 31 , ( right ) who wed her 30-year-old husband Andrea Casiraghi ( left ) in 2013 , made Forbes ' 2015 World 's Billionaires list at number 847 , with an estimated net worth of $ 2.2 billion . Mr Casiraghi - the eldest son of Princess Caroline and her second husband Stefano Casiraghi , and the eldest grandson of Rainier III , Prince of Monaco , and American actress Grace Kelly - did not appear on Forbes ' rich list . Though his net worth is unknown , his looks have earned him plenty of credit over the years . The blonde aristocrat made Forbes ' 20 Hottest Young Royals list in 2008 , and was named the second most beautiful male royal of all time by BeautifulPeople in 2011 . Mrs Casiraghi was born in New York and raised between Geneva , Switzerland , and Paris . Her grandfather was cited the second richest man in Colombia by Forbes in 2011 , and died the same year at the age of 87 . Heirs : Mrs Casiraghi - pictured ( left ) with her 23-month-old son Sasha , as well as her husband ( right ) in November - inherited her fortune from her Bavaria brewery owner grandfather , Julio Mario Santo Domingo , in 2011 . Welcome ! Mr and Mrs Casiraghi waited a year and a half to publicly introduce Sasha to the world , which they did at Monaco 's National Day celebrations at the Palais Princier de Monaco ( pictured ) on November 19 . In his will , Domingo split his vast $ 8 billion fortune six ways between his children and grandchildren ; leaving Mrs Casiraghi and her New York-based DJ brother , Julio Mario Santo Domingo III , an equal share of $ 2 billion . Mrs Casiraghi , who founded an ethical fashion retailer called Muzungu Sisters in 2011 , met her husband while the two were at boarding school together in Fontainebleau , near Paris . They dated for seven years before tying the knot in a civil ceremony in Monaco on August 31 , 2013 . The pair later hosted a second celebration in Gstaad , Switzerland on February 1 , where they exchanged their vows in a candlelit Roman Catholic service . In addition to their son , the ceremony was attended by a number of their close family and friends , including Princess Caroline , Prince Albert and the groom 's siblings , Pierre , Charlotte and Alexandra . Baby bump : Mrs Casiraghi , pictured at Paris Fashion Week on January 26 , resides in Paris with her husband and son , and is approximately four months pregnant with the couple 's second child . Busy : The heiress , pictured in Paris in January , founded an ethical fashion retailer called Muzungu Sisters in 2011 and dedicates much of her spare time to charity work . Longtime loves : The pair , pictured at the Monaco National Day Gala in November , met when they were at boarding school together in Fontainebleau , near Paris . Society darlings : They dated for seven years before tying the knot in a civil ceremony in Monaco on August 31 , 2013 . Pictured , the couple in September at a friend 's wedding ceremony in Germany . Mr and Mrs Casiraghi , who , in addition to carrying out their royal duties , both support a number of children 's charities and a cerebral palsy fund called the Motrice Foundation , waited a year and a half to publicly introduce their son Sasha to the world . In November of last year , they appeared with him at Monaco 's National Day celebrations at the Palais Princier de Monaco alongside the rest of the royal family , including Prince Albert and his then-pregnant wife Charlene . Princess Charlene , 39 , gave birth to twins Gabriella and Jacques on December 12 .
Andrea Casiraghi , 30 , is the eldest son of Princess Caroline and her second husband , the late Stefano Casiraghi . He is currently fourth in line for the throne of Monaco . Tatiana Casiraghi ( née Santo Domingo ) made Forbes ' 2015 World 's Billionaires list at number 847 . The 31-year-old socialite inherited $ 2.2billion from her grandfather Julio Mario Santo Domingo , former owner of the Bavaria beer brewery , in 2011 . Mr and Mrs Casiraghi , who wed in 2013 , have a son , Sasha , who turns two this month , and are expecting their second child this summer .