The star of the movie 'Big Bang Theory', Johnny Galecki, is expecting his first child with his girlfriend, Alaina Meyer

Johnny Galecki's "The Big Bang Theory" is perhaps coming to an end, but his life as a father is just beginning.

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

"We are absolutely delighted to announce that we will soon be welcoming a kid into this crazy and wonderful world," the couple wrote on social media.

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"We ask you to respect our privacy during this time of celebration for us and our families. There is really love for all. We hope that ours is your member because we think yours is our member, "they added.

The pair made their debut at E! The People's Choice Awards in November 2018 and barely a month later, fans thought that the pair was engaged after the picture of the love birds wearing matching rings.

But it was not so and Meyer clarified with the hashtag #notmarried.

Galecki and his castmates are preparing for the finale of the "Big Bang" which will be broadcast in a few weeks. The cast that includes Jim Parsons (Sheldon), Kaley Cuoco (Penny), Simon Helberg (Howard), Kunal Nayyar (Raj), Mayim Bialik (Amy) and Melissa Rauch (Bernadette) posted sentimental farewell messages when of reading their final table. and scenes.

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"More feelings than words can express," he wrote next to the cast in the hallway of the show. And another of him wiping tears after reading his final text 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 Theater in Hollywood. It was the first time that a cast of a television series was receiving this honor.

The finale of the two-part series of "The Big Bang Theory" will air on May 16 at 8pm. EST on CBS.