'Big Bang Theory' star Johnny Galecki expecting first child with girlfriend Alaina Meyer

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'Big Bang' star takes leap of faith with 'Living Biblically'

'Big Bang Theory' star Johnny Galecki hopes to inspire conversations about faith with his new series 'Living Biblically.'

Johnny Galecki's show "The Big Bang Theory" might be ending but his life as a dad is just beginning.

The actor, 43, is expecting his first child with his girlfriend, Alaina Meyer, 21.

“We are absolutely over the moon to announce that we will soon be welcoming a little one into this crazy and wonderful world,” the couple wrote on social media.

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“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,” they added.

The pair made their debut at the E! People's Choice Awards in November 2018 and just a month later fans thought the pair were engaged after a photo appeared of the love birds wearing matching rings.

But it wasn't so and Meyer clarified with the hashtag #notmarried.

Galecki and his castmates are gearing up for the "Big Bang" finale which airs in a few weeks. The cast which includes Jim Parsons (Sheldon), Kaley Cuoco (Penny), Simon Helberg (Howard), Kunal Nayyar (Raj), Mayim Bialik (Amy) and Melissa Rauch (Bernadette) has been posting sentimental farewell messages during their final table read and scenes.

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"More feelings than words can express," he wrote next to the cast hugging in the show's hallway. And another of him wiping away tears after reading his final script with the caption, "So very sad. So very grateful."

The cast also made history. On Wednesday, they all cemented their handprints and signatures at the TCL Chinese Theatre in Hollywood. It was the first time a cast of a TV series received the honor.

The two-part series finale of "The Big Bang Theory" airs May 16 at 8 p.m. EST on CBS.