Kate Upton smiles close up. Pic credit: ©ImageCollect.com/Byron Purvis/AdMedia

Kate Upton is celebrating all things throwback, and not for the first time this fall.

The Sports Illustrated bombshell recently made headlines for hopping aboard the Teenage Dirtbag throwback trend, and she was back for more old-school action in an Instagram share posted ahead of the weekend.

Kate sizzled as she showed off an unbuttoned pants look, also reminding fans that she adores denim.

The wife of Justin Verlander posted on Friday. She shared an image of herself looking like a total bombshell while leaning back against leafy green foliage and outdoors.

Showing off her hourglass figure in a low-key way, the bikini queen wore a printed white tee with a red collar and sleeve piping, also posing with her hands placed up behind her head.

The mom of one added in patchwork and acid-wash jeans worn a little unbuttoned.