Ciara twerked on a Bronco ... but we're not talking about her husband!!
The singer and Sports Illustrated swimsuit cover model held a random dance party at a gas station this week ... shaking it with all her friends as her upcoming single, "J.U.M.P." played in the background.
Russell Wilson's wifey put herself through the open sunroof and propped her leg up on top of the car ... as two dancers posted up on the doors, and one more took the front of the whip.