Forget Desperate Housewives, the sexiest display at the Auto Show may have been one that started long after the doors were locked.

Show officials are trying to learn who sneaked a tipsy blond woman onto the Cobo Center show floor about 2:30 a.m. Monday to pose nude atop the new Dodge Challenger.

"We heard they were all over the Challenger," said Jason Vines, vice president of communications for the Chrysler Group, which earlier brought in the very-clothed actress Eva Longoria to pose with its exhibit. "Obviously, this car is a magnet. We want people to love these cars but not in that way."

Workers said security guards found the woman posing while more than a dozen others gawked and snapped photos with camera phones. Cobo Director Glenn Blanton said the city is investigating.

"If employees were involved, there will be discipline," he said.

Show officials are taking the security breach seriously. "The only people who are supposed to be on the floor at that time are people who are working," said Rod Alberts of the Detroit Auto Dealers Association, which sponsors the show. "We want to get to the bottom of this and make sure it doesn't happen again."