Kaley Cuoco Celebrates Daughter Matilda's First Birthday with Boyfriend Tom Pelphrey: 'Best Year of Our Lives'

Kaley Cuoco's baby girl is one!

On Saturday, the Flight Attendant actress, 38, celebrated her daughter Matilda's first birthday by sharing photos of herself, her boyfriend Tom Pelphrey and their little girl in a video montage on Instagram.

"🩷Matilda🩷 you are 1! Best year of our lives," Cuoco captioned the clip as the song "Growin' Up Raising You" by Gabby Barrett played over the top. "You are a gift from above and have brought the deepest perfect joy to our entire family!"

"Dada and I love you more than we could possibly ever explain," the proud mom continued. "I cannot wait to see who you become, but for now, please stay my precious 1-year-old forever. 🩷🩷."

Cuoco also gave a shout-out to Pelphrey, 41, for being a great father, writing, "@tommypelphrey thank you for being the best daddy (besides my own) the world has ever seen."

"She’s perfect.🩷," she added of their baby daughter. "🎈Happy birthday, angel girl! 🎂."

The montage clip began showing photos of Cuoco and Pelphrey bonding with their daughter as a newborn in the hospital and afterward, when they had brought her home.

In other footage, Matilda was captured laughing and playing at home and snuggling with her parents in various cute family moments from the past twelve months.

The actress's friends and fans were quick to share their birthday wishes for the little on in the comments, with Haylie Duff writing, "Congrats!! Big milestone! 🩷🩷🩷🩷" and Lacey Chabert adding, "Happy Birthday Matilda!!💕💕💕💕."

On Thursday, Cuoco shared a cute snap of herself and Matilda on her Instagram Story. In the photo, both were looking away from the camera as they wore strikingly similar expressions, making straight faces. “TWINNING,” Cuoco wrote across the photo.

She also included a snap of Matilda sitting behind the driver's seat in a parked bus and jokingly commented on how fast her daughter was growing.

“I left for 2 nights, came back to a teenager who apparently drives,” Cuoco wrote in her caption as her daughter placed both hands on the steering wheel.

Throughout her first year, Matilda has proven to be a huge Jonas Brothers fan, with her proud mom sharing several photos and videos of her daughter jamming out to the boy band's music.

In February, Cuoco shared an adorable photo of her baby girl as she wore a black Jonas Brothers T-shirt, sitting upright on a couch and looking at the camera.

Cuoco added a sticker that read "Mood" and tagged the Jonas Brothers over the sweet picture.

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Back in May, the actress revealed that her little girl loves the band's music.

In a video posted to her Instagram Story at the time, Cuoco held her daughter as music from the Jonas Brothers played. After a few chords, Cuoco noticed that Matilda's meltdown subsided.

"Not kidding. Was screaming," Cuoco captioned the story. "Turned on @jonasbrothers. Stopped crying lol we have a fan here folks."