Kaley Cuoco celebrated the upcoming birth of her baby girl with a lavish baby shower at a horse ranch over the weekend.

The Big Bang Theory star, 37 - who recently showed off her growing baby bump during a tropical getaway - was joined by her partner Tom Pelphrey and a host of family and friends, including actor Brad Pit, at a huge party thrown for the actress by her younger sister Briana Cuoco. 

The California native was glowing in a short-sleeve pink floral mini dress, which she teamed with white and red Valentino sneakers. 

The spectacular event featured a light show with 400 drones spelling spelling out 'Baby Girl Pelphrey 2023' as well as multi-color light figures of a mom and dad with a little girl in between them.

Aside from her sister and Pitt, 59 - who looked handsome as ever in a blue jumpsuit -those in attendance also included tennis player Prakash Amritraj, The Bachelor star Ali Fedotowsky, The Flight Attendant producer Suzanne McCormack, and singers Jonathan Bluth and Willa Ford, among many others. 

Kaley and her friends took to Instagram to share magical photos from the night, with the actress writing: 'Last night we got to celebrate our future unicorn surrounded by incredible friends, family & animals in the most magical environment.'

'Thank you to the very special group of people who made it a night we will all remember for the rest of our lives.'

The beauty wore her blonde tresses down and in a straight style for the night, with her bangs framing her face.

The actress sported minimal makeup for the night, with only a touch of eyeshadow to match her dress and matte lipstick.

In one snap Kaley was seen tenderly holding her far-along bump while posing with her girlfriends. 

Meanwhile Pelphrey sported a dark suit over a white button up and rocked a smattering of facial hair. 

At one point the star and her partner were onstage giving a speech. 

Meanwhile her sister showed off her incredible figure in a skintight black and white minidress.

Briana - who co-stars with her sister on The Flight Attendant - had her dark tresses slicked back into a bun.

She also shared a snap of her and Kaley's parents, Layne Ann Cuoco and Gary Carmine Cuoco at the venue. 

Another shot from the night featured a spectacular multi-layer cake with the words 'Baby Girl Pelphrey' on top as well as a number of personalized details, including a horse barn and the Hollywood sign. 

There was also another light sign in the sky that spelled out Tom + Kaley with a number of pink hearts. 

Yet another sign read 'It's a girl.' 

In another video from the night Cuoco was seen enjoying the night on the dance floor among her many friends.

Ali Fedotowsky also shared a myriad of snaps from the party, and wrote: 'I truly don’t even have the words to describe the magic of last night! The laughs, happy tears, and dancing will stay with me forever!'

'And oh my gosh, the drone show?!?!?! Swiped to see the video. It was one of the most incredible things I’ve ever seen! @kaleycuoco and @tommypelphrey your sweet girl is so so so loved!'

'Kaley my friend, I have never seen you radiate the way you do in this moment. You are absolutely GLOWING and your joy is completely contagious. I want to hug that belly of yours all day and soak it all up because it’s truly beautiful and emotional to witness. You were made for motherhood and I can’t wait to meet your sweet girl. Love you!'

Kaley broke her big pregnancy news in October by posting a Instagram album that showed her and Tom cuddling up to one another with a cake that had pink frosting inside.

'Baby girl Pelphrey coming 2023,' she wrote in her caption, gushing: 'beyond blessed and over the moon… I [heart] you @tommypelphrey !!!'

Both of them were wearing bands on their left hand ring fingers in the album, setting off speculation about whether they are engaged or married.

Kaley has been married twice before, first to actor Ryan Sweeting from 2013 to 2016 and then to equestrian Karl Cook from 2018 until their separation last year.