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Despite the vast literature on celebrity endorsements in advertising, research to date has not assessed whether and how celebrity-brand associations created via traditional endorsements or product placements compare to more natural associations that emerge from real-life celebrity images through social media. This experiment systematically compares the impact of different brand-celebrity associations on consumer perceptions of the celebrity's credibility and their responses to a new brand associated with that celebrity. The results reveal that, unlike more commercial brand associations, natural brand-celebrity associations can yield strong brand effects without eroding the celebrity's credibility. The findings are especially insightful given increasing numbers of natural brand-celebrity associations in social media.
Russell et al. (2017) studied this question.