Shirtless JWOWW Grinds Up Against This Guy — And It's Not Her Fiancé, Roger! (PHOTO)

Don’t worry, JWOWW and Roger fans — this is just an Instgrammed throwback photo of Jenni and her friend Joey in their college days. Clearly, our girl has aged well since she doesn’t look a day older now, but she does cover herself up a little more in public … sometimes.

And hey, she rocks camo, too. Maybe she’ll bring that trend back soon!

Were you nervous that JWOWW was unfaithful to Roger, or did you know it had to be an old pic? Tell us below, and then click here to play more Jersey Shore “Guess Who?”