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

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 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 tunic-style, striped top in shades of blue and white. 

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

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

She went makeup-free and wore her hair in a messy top knot. 

Based On A True Story is an upcoming comedic show inspired by a bizarre true event. It will stream on Peacock.

The series is about a realtor, 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 that she was expecting a baby girl with the 40-year-old actor after they confirmed they were dating just five months prior to the news.

Kaley and Tom met in April at the season four Ozark premiere. They were set up by their manager and the rest was history.

 'I heard his voice, and I turned around, and it was like my life was over, or just starting," Kaley told USA Today in May. "It hit me. It was love at first sight. We were immediately connected. I do feel like I've known him my whole life.'

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

'Baby girl Pelphrey coming 2023," Kaley captioned a series of Instagram snaps in October.  "Beyond blessed and over the moon… I [heart] you @tommypelphrey !!!'

This will be both Cuoco and her boyfriend's first child. 

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

Kaley captioning a snap of Tom carrying their towels, a straw hat, water bottles, flip flops and beach bag, 'Already in dad mode carrying a ton of s--t lol,' she teased.

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

Since announcing that 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 Valentines Day to the man that makes me smile this big every single day. grateful to be on this life adventure together ,my love! @tommypelphrey.'