Wilmer Valderrama Shares Hilarious TBT in Support of Demi Lovato

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While they might not be engaged yet, it's clear that Demi Lovato and Wilmer Valderrama are totally in love and super adorable.

On Thursday, Wilmer took to Instagram to post an awesome #TBT pic, which showed a side-by-side comparison between a screenshot of Demi looking super sexy in a black leather bustier from her "Cool for the Summer" music video, and Wilmer decked out in his Rocky Horror Picture Show costume in a screengrab from an episode of That '70s Show.

WATCH: Demi Lovato 'Would Say Yes' If Wilmer Valderrama Proposed

"Imitation is the highest form of flattery," Wilmer joked in the caption, "Thank you Demi..."

This is just one of the many racy, revealing outfits Demi rocks in the "Cool for the Summer" music video. Hopefully, Wilmer will be able to find a picture of himself in a bondage bra and short shorts for next weeks' #TBT.

NEWS: Watch Demi Lovato's Super Sexy 'Cool for the Summer' Video!

Recently, Wilmer spoke with ET about his relationship with Demi, and about the impact she's going to have on music and society. Check out the video below to hear how the 22-year-old singer is going to "redefine pop culture on a level that people can't even expect."