Kaley Cuoco is ready for a big change.

The Big Bang Theory alum shared that she and fiancé Tom Pelphrey are expecting a baby girl, who will be joining their 3-year-old daughter Matilda. 

“Completing our little family, what a dream come true!” Cuoco posted to Instagram June 10. “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!!!”

The 40-year-old gave Pelphrey a special title, dubbing him a “girl dad for life.”

Cuoco shared the news alongside several snaps, including one of Matilda, Pelphrey and herself biting into a cake which revealed their baby’s sex, as well as several photos of herself posing in front of a mirror showing off her growing baby bump.

The Flight Attendant actress also posted a 3D anatomy scan of their baby girl, quipping in the caption, “Yes, the last pic is our dainty princess giving us the middle finger!”