Chelsea Clinton welcomes her third child!

Oh, baby! Former first daughter Chelsea Clinton and her husband, Marc Mezvinsky, are officially a party of five!

The couple welcomed their third child into the world this morning, announcing the exciting news on Twitter.

"This morning we welcomed our son, Jasper Clinton Mezvinsky," the author wrote.

"We are overflowing with love and gratitude and can't wait to introduce him to his big sister and brother," she added.

Jasper joins Charlotte, who was born in September 2014, and Aidan, who was born in June 2016.

Jasper's famous grandparents, former US President Bill Clinton and former Secretary of State Hillary Clinton, also shared the happy news on Twitter, writing that they were "so thrilled" about their family's new addition.

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Chelsea married Mezvinsky, the son of two former members of Congress, in 2010. The family lives in New York.

Fun fact: If the little one had been born in New Zealand, he would've shared a birthday with Monica Lewinsky, who turned 46 today!