'Kim Kardashian can't eat burgers and Heidi Klum is no spring chicken': Carl's Jr. CEO opens up about the best and worst models he has hired for his famous commercials

The CEO of Carl's Jr. and Hardee's is opening up about his brand's famous commercials in a new interview. Andy Puzder says that the key to the success of the fast food brand spots is the ability of the company to pick hot up and coming models and stars (left to right: Kim Kardashian, Kate Upton, Heidi Klum, Paris Hilton) to be featured in the ads, and the anticipation that builds as people get excited to learn who will be featured next. He also revealed what models work for the brand, and the few that were a little underwhelming.