08/29/2013 at 06:00 PM EDT
The Labor Day holiday has come early for Adam Levine
The off-the-market mentor of The Voice
, 34, is stripped down to his skivvies in a shot posted on Wednesday by his fiancée
, Behati Prinsloo.
"70's porn called," the model wrote in an Instagram
caption to accompany the sexy photo. "It wants its vibe back. Immediately."
The couple has been engaged since July, following an L.A. proposal.
"He called my dad, he was a stand up guy, called my mom, he did the whole thing," Prinsloo said of Levine
in an interview, adding in additional chat, "I am so happy and excited and still can't believe it's true!"