It's officially a party of five for Chelsea Clinton.
The former first daughter, 39, and her investment banker husband Marc Mezvinsky have welcomed their third child, she announced on Monday.
Morning - Son - Jasper - Clinton - Mezvinsky
"This morning we welcomed our son, Jasper Clinton Mezvinsky," Chelsea tweeted to her 2.5 million followers. "We are overflowing with love and gratitude and can't wait to introduce him to his big sister and brother."
The happy couple—who wed in July 2010—are already parents to Charlotte,...