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Chelsea Clinton announced the birth of her third child with husband Marc Mezvinsky on Monday morning.
"This morning we welcomed our son, Jasper Clinton Mezvinsky," the author and former first daughter wrote Monday on Twitter.
"We are overflowing with love and gratitude and can't wait to introduce him to his big sister and brother," she added.
Her parents, former President Bill Clinton and former Secretary of State Hillary Clinton, chimed in on Twitter to welcome their new grandchild.
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I didn't know she was expecting......mazeltov!
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She kept that one quiet. Congrats!