Kathryn Dennis and Thomas Ravenel are already parents to daughter Kensington

Credit: Courtesy Kathryn Dennis

Meet the South Carolina’s newest little charmer.

Southern Charm stars Thomas Ravenel and Kathryn Dennis welcomed son St. Julien Rembert Ravenel on Monday, and the proud mom shared a photo of their newborn Thursday.

“Welcome to the world baby boy!” she captioned an Instagram of herself beaming down at St. Julien while holding him in the hospital.

Ravenel, 53, and Dennis, 24, are already parents to daughter Kensington Calhoun, 1½.

While announcing her pregnancy to PEOPLE in September, Dennis touched on her on-off relationship with the politician.

“We are friends,” she said. “We communicate and things are pleasant. That’s all I can really hope for.”