The sexy two-piece is part of a swimwear capsule collection that she’s collaborating on with another designer.
The mother-to-be talked about being a work horse all the way to the end of her pregnancy in the caption of the post.
A baby announcement could happen any day now from Gretchen and her fiancé Slade Smiley. Her due date is July 10.
The longtime couple first announced her pregnancy in December. They tried with IVF for several years with no success prior to their joyous reveal.
Their first child will be a girl and Gretchen and Slade, 45, have already picked out a name, Skylar Gray. The baby will be named after Slade's youngest son Grayson.
Do you think Gretchen will give birth before her due date? Sound off in the comments!