"@rickyb901 and I are so excited to welcome TWO little babies into this world," she captioned the Sunday post.
The image includes two onesies and an image of an ultrasound surrounding a framed image of text saying, “and then there were four.”
Us Weekly reported that the mom-to-be's own mother, Sarah Palin, commented in excitement. "ECSTATIC AND BLESSED X2!"
Her little sister, 18-year-old Piper Palin, also shared her excitement, writing in an Instagram story, “So excited for my sister and brother-in-law! TWO babies!!”
Willow Palin married Rickey Bailey in 2018 at an Alaskan lodge after getting engaged in December 2017.
The twins are due in December.
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