"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," she wrote.
Her famous parents, former President Bill Clinton and former Democratic Presidential Nominee Hillary Clinton, have not commented yet, but it's no secret they love their role as grandparents. Following Aidan's birth, the former first lady told supporters in Ohio, "I have to confess, I talk so much about being a grandmother, now I'm sure I'm going to be talking doubly about being a grandmother."
Photo credit: Getty
What do you think of the news about Chelsea and Marc's new addition? Let us know in the comments.