This study employed the social comparison theory, brand signally theory and the theory of planned behaviour (TPB) to examine the extent to which attributes of a celebrity endorsing a brand and brand values impact on young adults’ cosmetics brand attitude and purchase intention. Data was collected from 301 young adult South Africans. Structural equation modelling results revealed that cosmetics brand attitude was influenced by celebrity attractiveness, credibility, celebrity product expertise and the symbolic brand value enjoyed from the brand. The brand attitude in turn predicted purchase intention.

In fashion marketing, celebrity endorsement is a widely-used strategy to gain attention and produce positive brand knowledge (Carroll, 2009). Luxury brands use their social media accounts to post pictures of celebrity endorsers using their products. This is an effective strategy because celebrity endorsement posts could encourage fans of the celebrity to repost, like or comment on this post. This is beneficial for the brand because this results in more brand exposures. The question is how luxury brands can use celebrity endorsements successfully in the digital age. For example, should luxury brands localize the celebrity endorsement in social media? The dilemma of standardization and localization becomes very significant when luxury brands are facing a culturally different market (Liu et al., 2016). This paper examines the effectiveness of localized celebrity endorsements for luxury brands in Chinese social media based on an analysis of online big data and two experiments. First, a multi-level analysis of the posts of 33 luxury brands suggests that localized (Chinese) celebrity endorsers trigger more social media interactions than standardized (Western) celebrity endorsers. Next, the following experimental studies reveal that local endorsers do not enhance perceived brand luxury and individuals’ level of patriotism moderates the effect of localized (vs. standardized) celebrity endorsements on perceived brand luxury. For people with lower level of patriotism, localized celebrity endorsements reduce the perceived brand luxury. In contrast, for people with higher level of patriotism, localized celebrity endorsements lead to higher perceived brand luxury.

Not all celebrity endorsements have been successful on social media. However, our understanding of the effectiveness of luxury brand celebrity endorsement advertising are limited. On the basis of Self-Congruity Theory (Sirgy, 1985), Meaning-Transfer Model (McCracken, 1989), and Match-Up Hypothesis (Kamins, 1990; Kamins & Cupta, 1994), this study investigates whether three components of image congruity (i.e., brand-celebrity, brand-self, celebrity-self) would influence brand attitudes, ad attitudes, and self-brand connection, and subsequently, influence consumer engagement and purchase intentions. This study also tests the moderating role of consumer type (followers vs. unfollowers of the social media brand page) in these relationships. After conducting a series of pretests to select a focal brand and celebrities, responses from 219 US female adults were used to data analysis. The results of structural equation modeling showed that brand-celebrity congruity was positively related to ad attitudes and brand attitudes. Brand-self congruity was positively related to ad attitudes, brand attitudes, and self-brand connection. Self-celebrity congruity was positively related to ad attitudes and self-brand connection but was negatively related to brand attitudes. Ad attitudes were positively related to brand attitudes and engagement intentions but were not related to purchase intentions. Brand attitudes were positively related to engagement intentions and purchase intentions. Self-brand connection was positively related to engagement intentions, and engagement intentions were positively related to purchase intentions. Finally, the results of a multi-group analysis showed that for unfollowers (n=125), ad attitudes were positively related to engagement intentions but brand attitudes were not. On the contrary, for followers (n=94), brand attitudes were positively related to engagement intentions but ad attitudes were not. This study highlights that self-brand connection is the key to cultivating consumer engagement on social media, along with the consumer’s positive attitudes toward the celebrity endorsement ad and the brand per se. If luxury brands wish to interact with their followers and increase their engagement, they need to focus their efforts on improving brand attitudes and self-brand connection through their brand pages. Our findings suggest that celebrity endorsed advertising contributes to creating self-brand relationships (Dwivedi et al., 2016) but it should be considered as a long-term investment.

Many information sources have reported that celebrity endorsements of luxury fashion brands are considered one of the success factors that enhance the growth of luxury markets. Yet two contrasting views are held as to whether or not celebrity endorsements are necessary for luxury brands. One view in support of celebrity endorsements for luxury brands insists that the use of celebrities generally provides many beneficial advantages, serving as a good communication tool. Specifically, the celebrity endorsements are effective in increasing ad viewers’ attention, polishing brand images, introducing new brands, and repositioning existing brands (Erdogan, 1999), enhancing message recall (Friedman & Friedman, 1979), and generating favorable attitudes toward ads and brands (Atkin & Block, 1983). Above all, brands endorsed by celebrities often obtain high brand awareness, resulting in a rapid sales increase (Ruiz, 2008). In contrast, the other view is more concerned with the diminished luxuriousness that is overshadowed by celebrities, rather than realizing an immediate increase in sales (Dubois, Laurent, & Czellar, 2001). Celebrity endorsements in ads are expected to increase brand awareness and simultaneously reduce the brand rarity impacting a qualification for status, which is central to brand luxuriousness in particular (Berry, 1994). The publicly recognized brand names would draw more attention from average consumers than from rich consumers, as the wealthier are the less influenced by celebrity endorsements (Gaudoin, 2013). In addition, considering that luxury brands are already constructed with well-defined brand meaning and personalities, using non-celebrity endorsers with luxurious images would be as effective as using celebrity endorsers in terms of improving brand luxuriousness (Okonkwo, 2007). As such, celebrity-endorsed luxury branding strategies seem to be questionable, though they are popularly being adopted. The current study aims to reveal the overall effectiveness of the use of celebrity versus non-celebrity endorsers on consequential consumer evaluations and highlight the importance of congruence between the brand and the endorser (match-up).

Left unexplored is how a celebrity’s country-of-origin and fame contribute to brand internationalization. A 2x2x2 conjoint among 126 subjects finds that endorsements made by local celebrities generally enjoy a home advantage, but this COO-effect is moderated. Foreign celebrities from countries with reputed entertainment industries are at least equally strong endorsers.