NEW YORK - Presidential hopeful Hillary Clinton is a grandmother twice over.

Chelsea Clinton announced Saturday that she has given birth to her second child, son Aidan.

The 36-year-old daughter of former President Bill Clinton and current presumptive Democratic presidential nominee Hillary Clinton lives in New York.

Marc and I are overwhelmed with gratitude and love as we celebrate the birth of our son, Aidan Clinton Mezvinsky.

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— Chelsea Clinton (@ChelseaClinton) June 18, 2016

She and her hedge fund manager husband Marc Mezvinsky have a 20-month-old daughter, Charlotte. Both Charlotte and Aidan were born at Manhattan's Lenox Hill Hospital.

Mezvinsky is the son of former U.S. Rep. Edward Mezvinsky and former U.S. Rep. Marjorie Margolies-Mezvinsky.

On Twitter, Chelsea Clinton said the couple is "overwhelmed with gratitude and love."

Aidan is the second baby to be born to the child of a presidential candidate this year.

In March, presumptive Republican nominee Donald Trump's daughter Ivanka gave birth to her third child, son Theodore James.