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Chelsea Clinton announced the birth of her third child on Monday morning.

“This morning we welcomed our son, Jasper Clinton Mezvinsky,” the former first daughter, 39, tweeted. “We are overflowing with love and gratitude and can’t wait to introduce him to his big sister and brother.”

Jasper is Chelsea’s third child with husband Marc Mezvinsky, whom she married in 2010. His siblings, Charlotte and Aidan, are 4 and 3, respectively.

Hillary Clinton also retweeted the news with the caption, “Sharing some happy news this morning! Bill and I are so thrilled.”

Chelsea announced her pregnancy also on Twitter in January, writing, “Marc and I have loved watching Charlotte be such a wonderful big sister and we’re excited to watch Aidan become a big brother! We cannot wait to meet our newest addition later this summer.”