“My world!!! I can’t believe we’ll be a family of 5 in a matter of days,” the Dancing with the Stars alum, 26, captioned the image with husband Dakota Meyer, her son Tripp, 8, and their 15-month-old daughter Sailor.
The expectant mama recently posted a photo of her updated baby bump.
“3 weeks left,” she wrote.
Palin and Meyer announced their second pregnancy in December.
The daughter of Sarah Palin co-parents Tripp with ex-fiancé Levi Johnston.
3 weeks left ? A post shared by Bristol Meyer (@bsmp2) on