Meet Tatiana Casiraghi, a billionaire beer heiress and royal who was once Monaco's richest citizen

Although Monaco is one of the smallest countries in the world — with an area of just 0.78 square miles —  it is also one of the richest per capita.

According to Fox Business, Monaco had a wealth per capita of $2.1 million in 2019. The principality also has the highest GDP per capita in the world, according to the World Bank Group.

Described as the Billionaire's playground, Monaco has a zero-income tax policy that attracts the super-rich to its shores.

The American-born heiress had a net worth of $1.7 billion as of March 2019, Forbes reported. That same year, Casiraghi was recognized as the richest citizen of Monaco, though she has since fallen off Forbes' real-time billionaires' list.

Here's everything we know about the uber-wealthy socialite and member of the Monegasque royal family.

Tatiana Casiraghi was born as Tatiana Santo Domingo on November 24, 1983, in New York City.

Her grandfather, beer-brewing tycoon Julio Mario Santo Domingo, was named the second-richest man in Colombia by Forbes in 2011, before his death that same year. At the time of his death, his net worth was $8.4 billion.

As the owner of Bavaria, one of the largest breweries in South America, he later traded his ownership for a 15% stake in SABMiller, making the entire Santo Domingo family extremely wealthy.

When he died in 2011, one-sixth of his enormous wealth was left to Tatiana, according to Hello! magazine.

The elite boarding school is one of the most expensive boarding schools in the world. The price to attend is reportedly as much as $130,000 annually for tuition and boarding.

The school is also the oldest in Switzerland. One of the campus buildings, the Château du Rosey, was built in the 14th century, while the school was founded in 1880.

She majored in visual communications, with a concentration in photography.

She is married to Andrea Casiraghi, nephew of Monaco's reigning monarch, Prince Albert, and the grandson of American actress-turned-royal Grace Kelly.

At the time of his marriage to Tatiana in 2013, Andrea Casiraghi was second in line to become the Prince of Monaco.

In 2014, with the birth of Prince Albert II and Princess Charlene's twins, Princess Gabriella and Prince Jacques, the line of succession changed, making Andrea Casiraghi fourth in line to the throne.

Casiraghi gave birth to her first son, Alexandre Andrea Stefano Casiraghi, a few months before the royal couple married on August 31, 2013.

As they were not married when their first son was born, he was not originally given a place in the Monegasque line of succession.

According to the Constitution of the Principality of Monaco, legitimate heirs must be related by birth to the ruler, and their parents must be married. However, when the two wed in 2013, Sacha became fifth in line to the throne.

According to Vogue, the bride wore a V-neck Missoni dress with three-quarter-length sleeves and flat silver sandals, while her bridesmaids wore designer dresses from Dolce & Gabbana and Valentino.

Members of the Missoni family attended the wedding, as did Greek shipping heiress Eugenie Niarchos, according to Hello!

The couple had a civil ceremony at the Prince's Palace of Monaco in August 2013 followed by a religious ceremony in Gstaad, Switzerland, six months later.

Maximilian was named after Rainier III, the late Prince of Monaco and husband of Grace Kelly.

Casiraghi has worked in the fashion industry for years. She previously held a position at the Aeffe fashion house in New York under creative director Giovanni Biancho. She also held a position at Vanity Fair.

Italian fashion heiress Margherita Missoni is a member of Casiraghi's inner circle, and the two have been spotted together at multiple fashion shows and industry events.

According to W Magazine, Alikhani has held positions at the United Nations High Commission for Refugees (UNHCR) and at the Human Rights Watch in New York. She's also served as a Middle East political analyst for a global business risk consultancy in London.

Founded in 2011, Muzungu Sisters collects and resells sustainable and ethically sourced goods from 20 artisan communities across the world.

The brand's website claims that purchases "stimulate local economies" in India, Morocco, Peru, South Africa, Colombia, and more.

Dresses, tops, and skirts on the site hover around $250 to $900, while the brand's iconic basket bags go for around $350.

Here the socialite is pictured at the Giambattista Valli Haute Couture Spring Summer 2017 show with Diane Von Furstenberg and her granddaughter Talita Von Furstenberg.

When she's not attending fashion industry events or spending time with her royal family members, Casiraghi enjoys visiting her favorite haunts in New York, Paris, and London.

In 2015, the heiress revealed to W Magazine that her favorite spots for going out on the town were Bar Pitti and Indochine in New York, Ferdi in Paris, and Maggie's Club in London.