See Behati Prinsloo's hot Instagram photo of fiance Adam Levine running around shirtless and nearly naked in a pair of black underwear. Credit: courtesy of Behati Prinsloo

Behati Prinsloo is a very lucky woman -- but she's sharing a little bit of the wealth! The 24-year-old supermodel posted a super sexy, candid shot of fiance Adam Levine on Instagram Wednesday, Aug. 28.

The silly photo features the Maroon 5 frontman, 34, strutting nearly naked in black underwear and dark shades. Levine shows off his muscular, tattooed bod while appearing to be stripping somewhere backstage.

Prinsloo jokingly captioned the photo, "70's porn called. It wants it's vibe back. Immediately." One of the Victoria's Secret Angel's followers responded, "GOD BLESS YOU FOR POSTING THIS."

Levine proposed to Prinsloo over the July 13 weekend in L.A., shortly after the two reunited after splitting earlier in the year. "It was a surprise," Prinsloo told Us Weekly on July 18. "It hasn't even sunk in yet! Last night, I forgot I slept with my ring on. I woke up and went, 'Oh, hello!'"

The "Moves Like Jagger" singer popped the question with a vintage, oval diamond ring. South African-born Prinsloo told ET Canada that her husband-to-be's proposal was "very old school" and he got down on one knee.