The ex-reality star also shared a photo of baby Kirra's "perfect little legs and toes".
Audrina even shared a video of her two-month-old daughter giggling.
The mum-of-one opened up about motherhood and her happy baby."We are so incredibly lucky! Kirra is the happiest, most beautiful baby with a constant smile and lots of goo-ing and gaa-ing! She loves giving Corey and I the biggest smiles," she wrote.
"I absolutely love being a mom — Kirra is my number one priority. If I’m being completely honest, the first month of no sleep, C-Section recovery, unpacking, and getting back into the swing of things was pretty grueling," Audrina continued. "But, at the end of the day, all I had to do was take one look at Kirra and none of that mattered anymore."