Andrea Casiraghi and Tatiana Santo Domingo welcome a baby girl

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Tatiana, 31, is reported to have given birth in London on Sunday
The couple already have a two-year-old son Alexandre, who is known as Sacha
Their baby girl in Princess Caroline's first granddaughter and his sixth in line to the Monegasque throne

Published: 08:12 EST, 14 April 2015 | Updated: 10:35 EST, 14 April 2015

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Monaco's royal heir Andrea Casiraghi and his wife Tatiana Santo Domingo are reported to have welcomed their second child, a baby girl.

According to People, Tatiana, 31, gave birth in London on Sunday, five months after the couple first announced that they were expecting another child.

The young girl, whose name is not yet known, is sixth in line to the throne, following her elder brother Alexandre, two, who is known as Sacha, her father Andrea, 30, her grandmother Princess Caroline, and reigning monarch Prince Albert's four-month-old twins with wife Princess Charlene, Prince Jacques and Princess Gabriella.

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Proud parents: According to reports, Andrea Casiraghi and his wife Tatiana Santo Domingo welcomed their second child, a baby girl, on Sunday

First born: Andrea and Tatiana already have a two-year-old son, Alexandre (pictured), who is known as Sacha

The news of the newborn princess' arrival comes just three months after her baby cousins made their public debut when they were presented to the world by their proud parents Albert and Charlene on the balcony of the Palais Princier in Monaco on January 7.

But while Prince Jacques and Princess Gabriella were introduced to a delighted crowd when they were just one-month-old, their cousin, and Andrea and Tatiana's eldest child Sacha, did not step out in public until he was 19-months-old, when he joined his parents and the rest of the royal family at Monaco's National Day celebrations in November.

Andrea met Tatiana, 30, at boarding school in Fontainebleau, France. After seven years of dating, they announced that they were engaged and expecting their first child together.

The couple married in August 2013, five months after they welcomed baby Sasha into the family.

Family tree: The newborn baby is sixth in line to the throne, while her elder brother and her father (pictured together in November) are fifth and fourth, respectively

They then 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.

LINE OF SUCCESSION TO THE MONEGASQUE THRONE

Prince Albert III, reigning monarch

1. Prince Jacques Honoré Rainier Grimaldi

2. Princess Gabriella Thérèse Marie Grimaldi

3. Princess Caroline Louise Marguerite

4. Andrea Albert Pierre Casiraghi

5. Alexandre 'Sacha' Casiraghi

6. Newborn Casiraghi

Tatiana, who co-founded ethical fashion range Muzungu Sisters in 2011, was born to a Colombian father and Brazilian mother, while her grandfather, Bavarian brewery owner Julio Mario Santo Domingo was cited as the second richest man in Colombia as of 2011.

After he died in 2011, Domingo's vast $8 billion fortune was split six ways between his children and grandchildren; leaving Tatiana and her New York-based DJ brother, Julio Mario Santo Domingo III, an equal share of $2 billion.

Andrea, the oldest grandchild of the late Grace Kelly and Prince Rainier III, grew up in France before attending McGill University in Montreal.

His younger sister Charlotte, an avid equestrian, has a one-year-old son named Raphael with her longtime beau Gad Elmaleh, an actor and comedian.

And Pierre, 27, the youngest of the siblings, is as yet unmarried, however it has been reported that he is set to tie the knot with Columbia University graduate Beatrice Borromeo later this year.

Andrea Casiraghi & Tatiana Santo Domingo in Ibiza (related)