Charlotte McKinney Stars in Racy Carl's Jr. Regional Super Bowl Ad

Perhaps one of the raciest Super Bowl spots, ever, will be seen on Super Bowl Sunday Feb 1, 2015 by less than half the country.

The regional ad by regional burger chain Carl’s Jr., which will mostly be seen by viewers in states in the West, features a Charlotte McKinneypromoting its new All-Natural Burger by walking though a farmers market apparently “au naturel.”

By using strategically placed fruits and vegetables sold by gawking vendors at the farmers market, the ad gives every indication that the 21-year-old model is starkers. “I love going All-Natural,” she says in the spot in a sultry voice, “It just makes me feel better.”

The ad promotes what the $4.69 burger does not have: no added hormones, steroids or antibiotics.