'The new light of our lives.' Kaley Cuoco shares beautiful pictures of new baby girl with boyfriend Tom Pelphrey.

The Big Bang Theory actor Kaley Cuoco has welcomed her first child.

The 37-year-old shared the news on Instagram, announcing she had given birth to a baby girl, Cuoco saying she and her actor boyfriend Tom Pelphrey are "overjoyed and grateful".

"The new light of our lives!" She wrote.

"We are overjoyed and grateful for this little miracle. Thank you to the doctors, nurses, family and friends who have helped us immensely over the last few days. We are blessed beyond belief."

She also did a shout out for Pelphrey and his support during the birth, adding: "[I] didn't think I could fall even more in love with you, but I did."

The couple shared the sweet name for their daughter: Matilda Carmine Richie Pelphrey.

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Pelphrey wrote in his own Instagram post: "My heart is full of love and gratitude for this miracle. Eternally grateful for the strength and bravery of my soulmate and best friend @kaleycuoco. You are incredible."

A bunch of celebrities have wished the new family well, including Chelsea Handler and Zooey Deschanel. 

In October 2022, the couple shared the news they were expecting together.

"Baby girl Pelphrey coming 2023... beyond blessed and over the moon," Cuoco captioned a series of photos, including one of an inside of a cake with pink frosting. 

And their baby shower was next-level impressive too, fit with a live band, multi-course dinner, dancing and more, with lots of famous friends in attendance like Brad Pitt and Regina King.

The baby shower also included a light show complete with 400 drones depicting a variety of scenes and messages, such as the words 'Baby Girl Pelphrey 2023' and a picture of a unicorn in the night sky.

The couple met in April 2022 when Cuoco's manager invited her to attend the Ozark premiere as her guest. Ozark was a major hit on Netflix, and in the latter seasons starred Pelphrey.

"When I met Tom, it was absolutely love at first sight," Cuoco told Extra. "It was like the angels started singing. I was like, 'Hallelujah!' It was very magical… it was perfect."

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That same month, Cuoco, who has been married twice before, told Glamour she would never tie the knot again.

"I will never get married again. Absolutely not. You can literally put that on the cover," she said. 

However, eagle-eyed fans have noticed Cuoco and Pelphrey both appear to be wearing rings in photos shared recently to Instagram.

Kaley Cuoco's past relationships.

Before meeting Pelphrey, The Flight Attendant actor was married to Karl Cook, a professional equestrian and son of billionaire Scott Cook. 

The pair began dating in 2016 before they tied the knot at a ranch in California in front of family, friends, and Cuoco's The Big Bang Theory co-stars in 2018. 

A year into their marriage Cuoco shared that she and Cook had a "very unconventional marriage" and weren't living together. 

"We have different locations that we're at a lot. You know, we're not together every single day and I think, personally, it's important, it works well for us," she told E! News. Cuoco later announced their separation in September 2021. 

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Before her marriage to Cook, Cuoco was previously married to professional tennis star Ryan Sweeting.

The couple were engaged after three months of dating before marrying on New Year's Eve 2013. 

The 36-year-old also previously dated her The Big Bang Theory co-star Johnny Galecki, who played her on-screen love interest for two years between 2008 to 2010. 

"I had a very big crush on Johnny early on," the actress said in excerpts from Jessica Radloff's book The Big Bang Theory: The Definitive, Inside Story of the Epic Hit Series obtained by Vanity Fair.

"I was so not even hiding it. He has such swagger. We were both dating people at the time, but I only had eyes for Johnny," Cuoco continued. 

"Then, when I found out he had eyes for me too, I was like, 'Uh‑oh, this is going to be trouble'."

More than 10 years on from their break-up, the pair are still great friends today.

"We've always had each other's backs, and you can't lose that. And I do think it happened on-screen. It made our relationship funny and endearing."

This article was originally published on October 12, 2022, and has since been updated with new information.

Feature Image: Instagram @kaleycuoco.