'Little People, Big World' stars Zach and Tori Roloff welcome second child: See the photos!

Sara M Moniuszko | USA TODAY

Zach and Tori Roloff have welcomed their second child: a daughter!

The "Little People, Big World" stars shared the news on their social media, adding that the baby girl arrived Tuesday, weighing 8 lbs., 9 oz. and measuring 18.5 inches long.

Lilah Ray Roloff joins brother Jackson Kyle, 2, who was born in May 2017.

Tori shared a photo of baby Lilah to her Instagram wearing a yellow headb.

"Welcome to the family sweet baby girl!" she captioned the photo.

Sister-in-law Audrey Roloff commented, "SHE IS PERFECT... we love her so much already."

TLC, the show's network, also commented: "She is BEAUTIFUL!!!!"

Zach also shared photos of the newborn to his Instagram along with the caption, "Love her!"

In an interview with People, the new mom of two shared her excitement.

“Zach and I are so excited to introduce you to our sweet baby girl Lilah. She has been the perfect addition to our family!" she said.

Lilah won't be the newest addition to the Roloff family for long.

Audrey and husband Jeremy announced in August that they're expecting their second child. The show alums' son will join their 23-month-old daughter, Ember.

In a gender reveal video at the time, the family stands in a field of green grass and people count down to the couple waving sticks that emit clouds of blue smoke. Ember eats a cupcake with blue icing and Jeremy shows ultrasound photos.

"We’re so excited!” Jeremy captioned his post.

Audrey captioned her post, "We are surprised and can’t wait to be a family of four."

Contributing: Sonja Haller