Tom Arnold and Wife Expecting Baby Boy

"We're really happy. I didn't think it was in the cards for me, I'll be honest, and so I was completely shocked," Arnold, 53, says. "It's a miracle."

Married three times prior to tying the knot with Groussman, 37, in Maui in 2009, the dad-to-be admits his fertility struggles — "I have a very low sperm count" — have played a part in all of his relationships.

"It is hard on the women," Arnold, who recently played Georgie on Sons of Anarchy, shares. "I've tried with other people, but since there is a God we were unable to conceive. Now God said, 'This is it!'"