The former First Daughter tweeted: “Marc and I are overwhelmed with gratitude and love as we celebrate the birth of our son, Aidan Clinton Mezvinsky.”
Chelsea Clinton and Marc Mezvinsky already have a daughter, Charlotte, born in 2014.
Aidan Clinton Mezvinsky is the second grandchild for Democratic presidential candidate Hillary Clinton and her husband, former President Bill Clinton.
Hillary Clinton describes herself as “wife, mom, grandma” in her own twitter bio.
Chelsea Clinton has frequently supported her mother at political events, most recently appearing alongside her in Brooklyn, New York, on June 7, when she secured the Democratic nomination.
Hillary Clinton’s opponent, presumptive Republican nominee Donald Trump, also welcomed a new grandson recently.
Donald Trump’s daughter Ivanka had a third child, Theodore, in March.
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