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Kevin Jonas and his wife Danielle hit the dancefloor with a vengeance over the weekend while partying at Bellagio's The Bank Nightclub in Las Vegas.

Mrs. Jonas, wearing a white, skin-tight party dress looked smoking hot while getting down with her main man.

Spies inside the club tell us that Kevin and Danielle hardly sat down, but when they did, they stayed cozy in the VIP section all night long.

What happens in Vegas ...