During an interview via Skype with 40 students from Hathaway Brown School in Shaker Heights, Chelsea said, "Marc and I are very excited that we have our first child arriving later this year."
Chelsea and her mother, Hillary Clinton, were taking questions from girls at the school as part of an initiative called, 'Girls: A No Ceilings Conversation.'
Clinton married Marc Mezvinsky in 2010.
Chelsea also announced the news on Facebook and Twitter:
Marc and I are so thrilled to be expecting our first child in the fall! Thank you for all of the kind words!
— Chelsea Clinton (@ChelseaClinton) April 17, 2014