"Oh. My. G-d!!!!!!!!!! I'm so happy for you both!!! Xx," the star wrote.
The on-and-off-again relationship between Carrie Bradshaw and Mr. Big hooked viewers for the show's six seasons.
Chris Noth in the movie Sex and the City 2. Photo / SuppliedKristin Davis, who played Charlotte York Goldenblatt on the show also offered her congratulations, commenting "Yay yay yay!".
Noth and Wilson married in 2012, after meeting at a NYC music venue he co-owns in 2002.
They have an 11-year-old son together named Orion.
Noth is also known for his roles as Law and Order detective Mike Logan, and Peter Florrick on the show The Good Wife.