Madonna wasn't always a Material Girl. In fact, sometimes she skipped the material altogether.

Nude photos of the pop icon, taken in 1977 when she was an 18-year-old college student, have hit the auction block after surfacing among the possessions of Penthouse founder Bob Guccione, who died in 2010.

According to information provided by the Guccione Collection, Madonna Louise Ciccone was a dance student at the University of Michigan when she agreed to pose for $10 an hour for photographer Herman Kulkens.

The brunette future superstar is featured in various states of undress, ranging from merely topless to flashing full-frontal nudity.