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Chelsea Clinton is a mom again.

She announced the arrival of son Aidan Clinton Mezvinsky late Saturday morning on Twitter.

Baby Aidan joins big sister Charlotte, who turns 2 on Sept. 26.

The 36-year-old Clinton, who announced her second pregnancy in late December, has been campaigning on behalf of her mother, presumptive Democratic presidential nominee Hillary. She is also on the board at her family's foundation.

She married Mezvinsky, 39, in 2010. He is also a fellow Stanford alumnus and the scion of a political family. His parents, Edward and Marjorie, both served in Congress.

In a statement, Aidan’s grandparents say they are overjoyed and “grateful for our many blessings.”

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.

Contributing: The Associated Press

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