The actor, 44, and his girlfriend, 21, are "over the moon."
"Big Bang Theory" star Johnny Galecki is going to become a father.
The 44-year-old actor and 21-year-old girlfriend Alaina Meyer announced they're expecting their first child together on Friday afternoon, confirming the news with a pair of Instagram posts.
"We are absolutely over the moon to announce that we will soon be welcoming a little one into this crazy and wonderful world," wrote the actor alongside a photo of the couple. "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."
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On her own page, she shared the same photo, adding, "So happy to announce that we are having a baby! There couldn't be a better blessing in the world for us and we are over the moon happy."
"We appreciate as much privacy in this time as we are celebrating with close friends and family, and we are happy to share the news with you," she Meyer wrote.
The two were first spotted together in the summer of 2018, before making their red carpet debut at the People's Choice Awards in November that same year.
The news comes after the cast of "Big Bang Theory" filmed the final episode of their long-running CBS series. The finale will air May 16 on CBS.