Shelley appeared on the fall and winter issue of JCPenney in 1975. In a spread entitled "Alluring Gowns in Soft Nylon," she modeled a melon-colored "tie-waist gown in nylon tricot." By 1975, Shelley had successfully transitioned from teen model to one of the top models in the business. A year later, she jumped to supermodel via the unforgettable Revlon Charlie ad campaign.