This study investigates how the endorsements of Internet celebrities (ICs) may drive consumer trust in their marketing campaigns, and subsequently affect impulse buying in relation to luxury fashion brands. Drawing on the framework of persuasion with a particular emphasis on the role of receivers, this study identifies five main characteristics, namely, the popularity of ICs, identification, IC adoration, social distance, and the perceived fit that may contribute to promoting impulse buying. A survey was conducted with 585 followers of IC in China. The findings reveal that trust is an essential factor that affects impulse buying. Identification and perceived fit both significantly contribute to increasing impulse buying through trust. Alternatively, large social distance may impair the relationship between trust and impulse buying. We conclude with implications for marketers that luxury fashion brands should seek cooperation not only with the most popular, but also with the most relevant ICs. An IC with a humble and relatable image can earn consumers’ trust and lead to an enhanced endorsement effect.