The couple revealed the birth of their little one on Friday.
The actor wrote on Twitter:"Delta Bell Shepard is here. She doesn't look like either @IMKristenBell or me, but we're gonna keep her anyway. #christmascameearly"
Bell also added her two cents, writing, "The estrogen has now hit critical mass! Good luck, @daxshepard1. And welcome to the world Delta Bell Shepard..."
She included a photo of a mama gorilla holding a baby gorilla's hand,