Kaley Cuoco is 40!

The Big Bang Theory star is celebrating a huge milestone birthday on Sunday, Nov. 30. The actress will likely be celebrating with her family, including her fiance Tommy Pelphrey and their daughter, Matilda.

Cuoco’s look has changed quite a bit since her time on the beloved sitcom. For 12 seasons playing Penny, Cuoco sported blonde hair of varying lengths. These days, she’s embraced that “lived in” look, with darker roots and a more golden hue in her mid-to-ends.

Since The Big Bang Theory came to an end back in 2019, Cuoco has been quite busy in both her personal and professional life. She’s starred in shows like The Flight Attendant, Based on a True Story, and Harley Quinn. Cuoco already has a couple of projects lined up for the upcoming year, including roles in Kansas City Star and Vanished, according to her IMDb page.

Perhaps the biggest life changes for her came by way of her personal life; she became a first-time mom in March 2023.

Cuoco and Pelphrey got engaged in August 2024.

“What a wild, beautiful journey life can be. Grateful for every road that led me straight to you @tommypelphrey,” she captioned a post on her Instagram Stories at the time. The couple has not shared any plans for an upcoming wedding.

Cuoco was previously married to Ryan Sweeting (2013-2016) and Karl Cook (2018-2022).

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This story was originally published by Parade on Nov 30, 2025, where it first appeared in the Celebs section. Add Parade as a Preferred Source by clicking here.