The 42-year-old fashion designer shared the news via Twitter on Saturday.
So excited to welcome our baby boy into the world...he's 7 lbs 12 oz, beautiful, healthy and we couldn't be happier— Rachel Zoe (@RachelZoe) December 23, 2013
Zoe and Berman have been married since 1996, the couple welcomed their first child, Skyler, in March 2011.
Zoe confirmed she was pregnant with her second child in a blog post she wrote in September.
"We are beyond excited for Skyler to have a sibling and for us to fall in love all over again," she wrote. "We feel incredibly blessed."
Duggar sisters unveil Christian dating rules in new book
LGBT community has 'bullied the American people': Bachmann