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You may think that Adam Levine serenading you with Maroon 5's "My Heart Is Open" (featuring Gwen Stefani) would be the best Valentine's Day gift ever ... but that's because you haven't heard Vin Diesel's version yet.

The Fast & Furious actor posted another amazing karaoke video to his Facebook, and this time he covers "My Heart Is Open." The video is captioned "Happy V Day..."

We have to give this one to Diesel ... he puts his whole heart into it. What more do you really need on Valentine's Day?

Watch Vin Diesel cover Maroon 5 & Gwen Stefani's "My Heart Is Open" below: