The Big Bang Theory alumni Kaley Cuoco has shared a cute post celebrating the first Father's Day since her partner Tom Pelphery became a dad.

The actress shared a series of photos of Pelphery with their daughter, Matilda (as well as their cute dog and Cuoco's own dad) on Instagram on June 18.

"Happy (first) Father's Day to Tildy's favorite person! @tommypelphrey watching you become a dad has been the joy of my life!" she wrote in the caption. "No one loves you more than that little lady (besides me) we [heart] you forever and appreciate all you do for our family!"

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She then continued: "And to my dad ! The greatest pops and gramps on earth! Matilda is one lucky widdle chunk!"

Cuoco recently revealed that she was filming her new TV show, titled Based on a True Story, right up until she was about to give birth to Matilda.

"I had to be on my feet a lot. It was a lot. And by the end, I was nine months pregnant," she explained while speaking to USA Today.

 "So the fight scene at the end near the grave — the fantasy — a lot of that was done by my double because it was like I was literally about to give birth, like, any second."

She also used a body double, complete with a prosthetic baby bump, to film all of the main character Ava's sexual fantasy scenes.

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"I don't roll that way. I need someone else to do that stuff. I'm past that. I'm not doing that anymore," she explained.

"Also, who wants to see that? Not my thing. I'd rather let someone else do it, and that's what's movie magic [is for]. We don't have to do those things anymore."