The 44-year-old actor announced earlier this month that he was going to be a dad.
"We are absolutely over the moon to announce that we will soon be welcoming a little one into this crazy and wonderful world," he gushed on Instagram. "We ask that you please respect our privacy during this celebratory time for us and our families. There truly is love out there for all. We hope ours is the ember of yours, as we feel yours is the ember of ours."
The baby news comes on the heels of the series finale of Galecki's hit CBS show, The Big Bang Theory. Here's more with the sitcom star: