“Can’t even,” the Dancing with the Stars alum, 26, captioned the cute closeup of her baby girl.
The proud mama also shared a mirror selfie with husband Dakota Meyer and their daughter.
“Our teeniest tiny is 3 months today!! she is the SWEETEST and i’m betting will be our easiest, so in love,” she wrote.
In June, Palin posted family photos — including their 1-year-old daughter Sailor and her 8-year-old son Tripp.
The mom-of-three welcomed her daughters with Meyer. She co-parents her son with ex-fiancé Levi Johnston.
In a recent blog post, the daughter of Sarah Palin wrote about Atlee Bay‘s easy birth on May 8.
“Her birth was a breeze, we had the best doctor/nurses imaginable, and Dakota did amazing!!” Palin wrote. “He held my hand, took care – and encouraged me the entire time, I could not have a more supportive husband. This pregnancy has strengthen our bond and made our relationship stand even firmer on the foundation that we have proudly built up for our little family. I’ve been wanting to do an update on here for months but haven’t had the time to sit down and even begin to gather my thoughts.”