Prince George and Princess Charlotte's younger brother might be the most famous royal baby born recently, but he's not the only one. The royal family of Monaco also has a new addition.

Andrea Casiraghi—the eldest son of Caroline, Princess of Hanover, and grandson of Prince Rainier III and Grace Kelly—welcomed his third child with his billionaire wife, Tatiana Santo Domingo, on Saturday.

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Princess Caroline of Hanover, Alexandre Casiraghi, Andrea Casiraghi, India Casiraghi, Tatiana Santo Domingo, and Charlotte Casiraghi attend the Monaco National Day Celebrations in the Palace Courtyard on November 19, 2016.

HOLA! confirmed that Max Rainier was born in Monaco on April 21; the child's name is an apparent tribute to his grandfather, who died in 2005 after ruling the principality of Monaco for nearly 56 years (his full name was Rainier Louis Henri Maxence Bertrand Grimaldi). Max Rainier is now seventh in line to the Monaco throne; his father is fourth in line, following his mother and Prince Albert II's two children.

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Pierre and Beatrice Borromeo arrive at the Rose Ball in March.

Casiraghi, 33, and Santo Domingo, who married in 2013, already have two children: a five-year-old boy named Alexandre Andrea Stefano "Sacha" Casiraghi and a three-year-old girl named India Casiraghi.

Santo Domingo, 34, "spent the last few weeks of her pregnancy focusing on her ethical fashion label, Muzungu Sisters," Hola! reports. She also spent time in the Swiss Alps with her family in February, where her husband and children skied while she watched.

Another royal baby is on the way for Monaco, too. Casiraghi's younger brother Pierre is expecting a child with his wife, Beatrice Borromeo, who displayed a baby bump under her black velvet gown at the Rose Ball in March. People reports that Borromeo is due in May.

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Sam Dangremond
Contributing Digital Editor

Sam Dangremond is a Contributing Digital Editor at Town & Country, where he covers men's style, cocktails, travel, and the social scene.