Clinton, the daughter of presidential candidate Hillary Clinton and former president Bill Clinton, was all smiles as she was photographed wearing a button-down white shirt and a pair of jeans, as she hailed a cab in New York City.
Any hint of a baby bump was masked by her red winter coat.
“Thank you for all the warm wishes,” Clinton wrote. “Marc, Charlotte & I are so excited about our growing family.”
Alongside the message, Clinton shared a photo of Charlotte in her lap while they read a book called I’m a Big Sister.
The mom-to-be, who also used the social media site to break the big news, told People in September that she was looking forward to giving Charlotte a sibling.
She explained, “I think my love for Charlotte has just opened more space in my heart and my brain that I didn’t even know was there.”