Klein revealed the happy news yesterday, reported Female First.
Sharing a photo of Thyfault's bump on Twitter, he wrote, "My beautiful wife Laina and I are expecting our first child.
"23 weeks along. Gratefully blessed on my 37th B-Day."
Klein and Thyfault tied the knot last year in August.
The Hollywood hunk, who was previously in a relationship with "Batman Begins" actress Katie Holmes, first met Thyfault at a mutual friend's wedding and proposed to the blonde beauty in Venice Beach, California, back in December 2014.
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