"I knocked my wife up," he told Conan O'Brien. "I had never impregnated anyone before, so I didn't really realize what they teach you in health class is actually true. That's all it takes. It's amazing."
Although McBride didn't reveal the sex of the baby, he joked that it would be well-endowed either way. McBride, whose comedy Your Highness opens Friday, wed Gia Ruiz in October.
Watch the rest of the rather cheeky interview in which he reveals where he hides dirty movie props: