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Chelsea Clinton has announced the birth of her third child with husband Marc Mezvinsky.
On Monday, Clinton revealed on Twitter that the couple had welcomed their second son that morning.
"This morning we welcomed our son, Jasper Clinton Mezvinsky," the daughter of Bill and Hillary Clinton wrote.
"We are overflowing with love and gratitude and can't wait to introduce him to his big sister and brother."
Clinton and Mezvinsky already have two children together – Charlotte Clinton Mezvinsky, born in September 2014, and Aidan Clinton Mezvinsky, born in June 2016.
The couple were married in New York in 2010 in an interfaith ceremony, Clinton being Methodist and Mezvinsky being Jewish.
Several Twitter users have wished the family congratulations on the announcement on of their new arrival.
"Congratulations! May you only have nachas, health, and love in your lives," one person tweeted.
Congratulations to the entire Clinton-Mezvinsky family. You are truly blessed," another added.
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Bill and Hillary Clinton are yet to comment publicly on the birth of their third grandchild.
In January, Chelsea Clinton revealed she was pregnant with her third child.
The former first daughter tweeted: "Marc and I have loved watching Charlotte be such a wonderful big sister and we're excited to watch Aidan become a big brother."
The 39-year-old added she and her husband "cannot wait to meet our newest addition later this summer".
Clinton has written several children's books, including She Persisted: 13 American Women Who Changed the World; Don't Let Them Disappear, a tale about 12 endangered species; and It's Your World: Get Informed, Get Inspired and Get Going!
The author is also vice chair of the Clinton Foundation, working alongside the organisation's partners to "help create greater opportunities for people to build better futures for themselves, their families and their communities".
Clinton's husband, Mezvinsky, is an investor and former vice chairman at venture capital firm Social Capital.
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