"So excited to introduce you to our tiniest princess, Sailor Stevie," JoAnna captioned a sweet pic of the two cuddled close to their newborn, which was reposted by Nick. "She has stolen our hearts and our family feels complete. [Love], Nick, Jo, & Big Sister Emme."
JoAnna and the Atlanta Braves star revealed they were expecting baby No. 2 back in February with a collage of sweet black-and-white photos featuring their first-born daughter, 3-year-old Emerson "Emme" Jay.
"Nick, Emme, and I are so excited to finally share this news...," JoAnna captioned the adorable snap.
In more baby news, Mila Kunis and Ashton Kutcher are also expecting their second child together. The pair, who will be celebrating their one-year wedding anniversary on the Fourth of July, are already parents to their 1-year-old daughter, Wyatt Isabelle.
Ever since the Bad Moms actress' rep confirmed the news to ET last month, the brunette beauty hasn't been shy about giving fans a peek at her burgeoning belly. Hear more (and see the pics!) in the video below.