Kristen Bell and Parenthood hubby, Dax Shepard, have shared the news of the arrival Friday of their second daughter Delta Bell via Twitter.

Little Delta Bell joins her 21-month-old big sister, Lincoln.

“Delta Bell Shepard is here. She doesn’t look like either Kristen or me, but we’re gonna keep her anyway,” Shepard wrote about her new daughter.

“The estrogen has now hit critical mass! Good luck, Dax. And welcome to the world DELTA BELL SHEPARD,” Bell added.

In November, the Frozen actress donated more than $91,000 worth of baby supplies to needy families.

“I understand the importance of having the essential tools necessary to provide for a newborn. Greater still, I am aware of the immeasurable value of having support systems in place to ensure success on this journey of motherhood,” Bell told ABC News. “Anything I can offer in support and care to new moms in need remains a huge priority to me.”

Delta Bell Shepard is here. She doesn't look like either @IMKristenBell or me, but we're gonna keep her anyway. #christmascameearly

— dax shepard (@daxshepard1) December 20, 2014

Crying in the car to @joshgroban christmas songs has got to be an early sign of labor, right?

— Kristen Bell (@IMKristenBell) December 19, 2014

The estrogen has now hit critical mass! Good luck, @daxshepard1. And welcome to the world DELTA BELL SHEPARD 🙂 pic.twitter.com/72AFmnjmoC

— Kristen Bell (@IMKristenBell) December 20, 2014

Just before Delta’s arrival, Shepard posted a video of his wife doing what most expecting, and impatient, new mom’s do — try to get labor started any way possible.

“Certain members of the family are READY for other members of the family to kindly exit their body,” he captioned the video of Bell bouncing on a ball.

Certain members of the family are READY for other members of the family to kindly exit their body: http://t.co/fc5NxVRQqo @imkristenbell

— dax shepard (@daxshepard1) December 17, 2014

In the weeks leading up to Delta’s arrival, the couple shared a slew of adorable photos of themselves.

A photo posted by kristen bell (@imkristenbell) on Dec 12, 2014 at 3:52am PST

Who is ready for #Christmas ??

A photo posted by kristen bell (@imkristenbell) on Sep 9, 2014 at 12:34am PDT