Kaley Cuoco is expecting her second child with Tom Pelphrey. 

The “Big Bang Theory” alum’s fiancé took to Instagram Wednesday to share the happy news – and divulge the baby’s sex – with a joyful announcement. 

“Deep gratitude and joy- so much respect and admiration for @kaleycuoco on this journey of ups and downs. 🙌🙌🙌” Pelphrey captioned a pic with Cuoco and their daughter Matilda, 3, holding a colorful cake with a pink center. 

Kaley Cuoco and Tom Pelphrey announced the impending arrival of their second child in a new Instagram post (as seen above). Instagram/Tom Pelphrey

Pelphrey shared a photo of their gender reveal cake, which had a pink center. Instagram/Tom Pelphrey

In the Instagram carousel, Pelphrey, 43, shared a sonogram image of their impending arrival. In it, the baby appears to be holding up a middle finger. “Doc gave her a little prod for the pic and this was her immediate response…. definitely my child,” Pelphrey joked.

He also shared a sweet pic of Cuoco holding and snuggling Matilda during a movie, and a snapshot of the sprinkle-covered cake, which read “It’s a…”

A large bite had been taken from the cake, revealing the bright pink center.

Cuoco, meanwhile, took to her own account to share Pelphrey’s joy. “💖 completing our little family , what a dream come true ! 💖 ” she captioned a cake photo with Matilda and her fiancé — along with several mirror selfies of her growing baby belly.

Pelphrey also shared a sonogram image (as seen above). Instagram/Tom Pelphrey

Cuoco shared photos of her growing baby belly in her own announcement post, as seen here. Instagram/Kaley Cuoco

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“This second time around journey has been a little windier in many ways, but wow we are so grateful for this moment!! Little sissy on the way!!! @tommypelphrey girl dad for life 🎀 and yes, the last pic is our dainty princess giving us the middle finger!🤦🏼‍♀️😆”

In one snapshot, Cuoco, 40, showed off a humorous tank top reading, “I cried today.” In another, she snapped a mirror selfie while wearing an LED light therapy mask.

The actress also shared a clip of Pelphrey smiling as the couple viewed sonogram images of their baby in a doctor’s office.

Yet another snap showed Pelphrey cradling Cuoco’s belly as Matilda stood nearby for a family photo.

Followers took to the comments thread to congratulate the actress and her family on the happy news.

Cuoco wore an LED light mask in one photo, as seen here. Instagram/Kaley Cuoco

Another snapshot showed Pelphrey cradling Cuoco’s belly (above). Instagram/Kaley Cuoco

“Yessss! I have it on good authority that all girls is the BEST! Congrats!!” one person gushed, while another remarked, “So happy and excited for you. Best thing you can do for your child. Siblings so important ❤️”

“OMG Congratulations! Mathilda will be such a cute big sister 🥹🫶🥳” a third person chimed in.

Cuoco and Pelphrey’s happy news comes three years after they welcomed Matilda in March 2023.

Over a year later, the couple announced their engagement in an emotional social media post.

“Amazing weekend,” she captioned a pic of herself nuzzling Pelphrey as she showed off a massive diamond ring.