What changes have been made to the body style of the Buick Regal since its inception?

The Buick Regal has definitely evolved from the 1st generation, when it was called the Buick Century Regal as a sedan/coupe style. The next generation added a station wagon model. 3rd and 4th generations resembled the Lumina, with a 'W body', and the latest generation is a 4 door sedan.