"Paradise with my loves," Ashley, 29, captioned the photo.
In the photo, Ashley, Austin and Brooks were all flashing big smiles, as Ashley gently cupped her baby bump.
Fellow The Bachelor alum Annaliese Puccini -- who competed on Arie Luyendyk's season of The Bachelor and appeared on Seasons 5 and 6 of Bachelor in Paradise -- commented on the sweet picture, "Congratulations," along with three heart emojis.
Ashley first announced she was pregnant with Baby No. 2 on September 7.
"We are over the moon about our Baby GIRL," she posted to Instagram, "arriving in March."
Ashley and Austin began dating when they both attended Auburn University.
After Ashley filmed Season 19 of The Bachelor starring Chris Soules and then Season 2 of Bachelor in Paradise, she returned to Georgia and sparked up a romance with the commercial real estate broker again.