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Chelsea Clinton, Marc Mezvinsky expecting baby No. 3

Chelsea Clinton revealed on social media Tuesday that she and her husband, Marc Mezvinsky, are expecting their third child.

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The couple has two children together -- Charlotte 4, and Aidan, 2.

“Marc and I have loved watching Charlotte be such a wonderful big sister and we’re excited to watch Aidan become a big brother!” Clinton, the daughter of former presidential candidate Hillary Clinton and former President Bill Clinton, said in a post on Twitter.

“We cannot wait to meet our newest edition later this summer,” she wrote.

Clinton has authored several children's books, and her latest, "Start Now! You Can Make a Difference," explains to children how they can help make the world a better place through helping with issues such as hunger, bullying and climate change.