Advertisers commonly use celebrity endorsers to increase the effectiveness of advertising in persuading consumers. In many cases, these celebrities endorse more than one brand. Little is known, however, about the benefit to brands from these multiple endorsements by the same celebrity. This research applies classical conditioning theory to an exploration of multiple brand endorsements by a single celebrity, and examines how brand concept consistency between endorsed brands affects consumers’ evaluations of the endorsed brand. The findings, over two separate studies, indicate that exact and high concept consistency between endorsed brands positively influences consumers’ attitude toward these brands.