Kaley Cuoco shows off her baby bump while having lunch with her famous actress sister Brianna Cuoco

Kaley Cuoco shows off a blooming baby bump in a button-down top while having lunch in Los Angeles with sister actress Brianna

Kaley Cuoco stepped out with her sister, actress Briana Cuoco, and her boyfriend, musician Brian Logan Dalles in Calabasas, California on Monday.

The Big Bang Theory alum, 37, is expecting her first child, a girl, with her boyfriend, Ozark actor Tom Pelphrey, 40.

The Flight Attendant star, who is filming a new series called Based On A True Story, kept things casual in a striped tunic top in shades of blue and white.

She paired the comfy top with black leggings and a pair of white Chloe sandals.

The Harley Quinn actress wore a black and white crossbody bag and sunglasses to shield her eyes from the Southern California sun.

She removed her makeup and wore her hair in a messy bun.

Baby on board: Kaley Cuoco showed off her very pregnant belly at lunch with her sister Briana Cuoco on Monday in Calabasas, California

Based on a true story is an upcoming comedy show inspired by a strange true event. It will air on Peacock.

The series is about a real estate agent, a plumber and a former tennis star whose lives collide in a story that explores America’s obsession with serial killers and true crime.

Last October, The Flight Attendant star announced she was expecting a girl with the 40-year-old actor after they confirmed they were dating just five months before the news broke.

Kaley and Tom met in April at the season four premiere of Ozark. They were tended to by their manager and the rest is history.

“I heard his voice, turned around, and it was like my life was over, or just beginning,” Kaley said. USA Today In May. “He hit me. It was love at first sight. We hit it off right away. I feel like I’ve known him my whole life.”

And then six months later, the happy couple announced that they were expecting!

“The Pelphrey girl is coming in 2023,” Kaley wrote in a series of Instagram snaps in October. “More than blessed and over the moon… I [heart] you @tommypelphrey!!!

This will be the first child for Cuoco and her boyfriend.

Trio: The trio kept things casual and women took to Sephora on a sunny winter day.

Trio: The trio kept things casual and women took to Sephora on a sunny winter day.

The couple took a pre-baby vacation over New Years, and the 8 Simple Rules star shared snaps of their romantic getaway on her Instagram Stories on Dec. 30.

Kaley captioned a snap of Tom carrying his towels, a straw hat, water bottles, flip-flops, and a beach bag, “I’m already in dad mode carrying a ton of s–t lol,” she joked.

A month earlier, the couple celebrated Kaley’s 37th birthday, which she called “The sweetest early birthday celebration ever.”

Ever since they announced they were expecting, Kaley has been sharing every moment of her pregnancy with fans.

On Valentine’s Day, she shared a sweet snap and captioned it, “Happy Valentine’s Day to the man who makes me smile this big every day.” grateful to be on this life adventure together, my love! @tommypelphrey.’

Coming soon: Kaley's baby will be the first child for her and boyfriend Tom Pelphrey

Coming soon: Kaley’s baby will be the first child for her and boyfriend Tom Pelphrey