Jon Hamm is “very excited and deeply terrified” about becoming a dad. The actor broke his silence on wife Anna Osceola‘s pregnancy news during a “Late Night With Seth Meyers” appearance Tuesday evening. “I think I’m doing it right,” the “Your Friends & Neighbors” star, 55, said of his conflicting emotions, noting that he doesn’t think those feelings should ever “go away.” He subsequently poked fun at his “old dad” status, saying, “When your kid is 70, you’ll be like, ‘I did it!’ When I’m 152.” A report surfaced in August that Hamm and Osceola, 38, have a little one on the way. The actress debuted her baby bump on the Emmys 2026 red…