Chelsea Clinton is expecting another baby

Chelsea clintonRob Kim/GettyChelsea Clinton.

Chelsea Clinton is expecting a baby next summer. 

The vice-chair of the Clinton Foundation and only child of Bill and Hillary Clinton announced on Twitter that her daughter, Charlotte, would be a big sister next summer. 

In the photo posted to Twitter, Charlotte was reading a book titled, “Big Sisters are the Best.”

Clinton’s husband is hedge fund manager Marc Mezvinsky. The couple’s first child was born in September 2014.

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