Lamborghini will produce 80 to 90 units of the Concept S roadster.
The design study (shown), which debuted at the Geneva auto show in March, was supposed to only give clues about the Italian sports car maker's roadster version of the Gallardo coupe.
But high demand for the Concept S convinced Lamborghini to make the car, which will have no roof and two separate cockpits.
Lamborghini also will make the Gallardo roadster, likely to be called the Spyder. That car will be unveiled at Frankfurt's IAA in September.
No prices have been set for either model.