"Nap time = The Best Time," the actor captioned the revealing black and white photo on Instagram that features his spouse laying down on her side with her face buried into a pillow.
The steamy pic was shared hours before Dewan attended the 18th annual InStyle and Warner Bros. Golden Globe after-party where the "Supergirl" star was seen rocking a strapless black gown with a thigh-high slit.
This is the second time Dewan has gone nude on social media with the actress sharing in October of 2015 topless photos of herself that were also taken by Tatum.
Recently, Dewan commented on her sex life with Tatum in the January issue of Cosmopolitan calling it "primal."
"I've always been a sexual person. We definitely have a very happy and healthy [sex life]," she told the magazine.
Dewan and Tatum met on the set of 2006 dance movie "Step Up." The couple tied the knot in 2009 and welcomed their first child, daughter Everly, in 2013.
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