“Marc and I have loved watching Charlotte be such a wonderful big sister and we’re excited to watch Aidan become a big brother!” she wrote on Twitter. “We cannot wait to meet our newest addition later this summer.”
She then responded to a fan, saying that her parents, Bill and Hillary Clinton, were excited to become grandparents to another baby.
Clinton spoke to ET in 2016 about how her mom had influenced her parenting.
“My daughter, I find myself giving her ridiculous praise for doing things like putting the top back on the cereal container. I'm like, 'Oh Charlotte, that was so good. Thank you for putting the top back on,'” she said. “And she beams at me and I'm like, 'Oh my gosh, I'm just like my mother.'"