The TV personality and her husband, Jared Pobre, celebrated the baby news with Keibler taking to Instagram to share the an image of herself with newborn daughter Isabella.
"Today is so special because it's my first Mother's Day as a family of five!" she added the caption. "My heart is filled with so much love. We are so incredibly blessed to welcome Isabella Faith to our family. Wishing all Mommas out there a very Happy Mother's Day."
Keibler and Pobre wed in March, 2014 and share daughter Ava, five, and son Bodhi, one.