Shelley first became famous in the 1970s as THE Charlie Girl. In 1976, she was hand-picked to represent the Revlon Charlie brand, as she was the embodiment the brand's ideal – gorgeous, sexy and young. Makeup artist Rick Gillette recalls, "Shelley Hack was really the perfect girl for Charlie. I remember when Revlon creative director David Leddick had Steen Svensson shoot the first presentation with her that got her the contract."
Shelley was THE quintessential Charlie Girl and appeared in many, many ads for the brand. In 1977, she appeared in a newspaper ad for Charlie called "Charlie's Show-Case." It was a promo that offered the Charlie's Show-Case, a fashionable $30 mirrored case containing Charlie makeup and perfume, for just $6 with any $5 or more purchase from the Charlie Collection by Revlon. Now wasn't that a great purchase.