Adam Levine’s Fiancée: Check Out My Future Hubby in His Undies!

If you have ever looked at Adam Levine and wondered "boxers or briefs?" you now have your answer, courtesy of his fiancée.

The Maroon 5 frontman's bride-to-be, Behati Prinsloo, put a photo of the singer — in his undies — on blast Wednesday. And, gulp, she likened her future husband to a cheesy porn star!

"70's porn called," the Victoria's Secret model wrote, along with the Instagram pic. "It wants it's vibe back. Immediately."

And what a vibe! In the snapshot, "The Voice" mentor shows off his famously tattooed bod — and abs! — as he runs down a hallway in nothing but a pair of black, low-slung briefs and sunglasses.

[Related: 5 Things to Know About the Future Mrs. Adam Levine, Behati Prinsloo]

We hope Levine opts for a little more coverage when they do tie the knot. The couple dished up one of the more surprising headlines of the summer when they announced in July that, after being broken up for several months and Levine having a new girlfriend, they were suddenly back together and engaged.

Prinsloo's Instagram pic comes as a bit of a surprise not only because Levine is nearly naked. The duo is actually pretty private when it comes to their relationship, and while she regularly posts photos on Instagram, they are typically of herself, not him.

Well, we respect her editorial judgement. This was a great one to share.

More Celebrity Features on Yahoo!: