The emergence of the video blog (vlog) and the success of so-called “YouTube celebrities” have provided luxury brands with a new marketing tool to connect with consumers. In particular, the video-sharing site YouTube, allows anyone from an amateur to a professional the opportunity to create and upload a video, which can possibly be shared by hundreds of millions of viewers instantaneously and inexpensively (Freeman & Chapman, 2007). The present study examines how video blog (vlog) influences luxury brand perceptions based on parasocial interaction (PSI) framework. PSI has been studied extensively in communication research and provides a foundational understanding for the one-way relationship experienced between a media personality and media users. PSI is often referred to as a “friendship” with a media personality (Perse & Rubin, 1989; Rubin et al., 2003; Eyal & Rubin, 2003) and media users often seek advice from media personalities as if they were friends (Rubin et al., 1985). In addition, social comparison theory (Festinger, 1954) is used to explain the effect of PSI on customers’ luxury brand perceptions. According to the social comparison theory, individuals evaluate themselves by comparing what they possess and consume to that of others. Since individuals are likely to compare themselves with significant others and peers who share a similar outlook and common values, they would compare their luxury possessions and consumption to that of vloggers as PSI increases. Therefore, this study proposes influences of physical attractiveness, social attractiveness and attitude homophily of video blogger (vlogger) on PSI; and PSI effects on luxury brand perceptions (i.e., brand luxury, luxury brand value, and brand-user-imagery fit) followed by luxury brand purchase intentions. Study 1 tested the hypothesized model using structural equation modeling, and the results support the proposed model. Additionally, Study 2 investigated vlog effects on luxury brand perceptions and purchase intentions using ANOVA. The result showed luxury brand perceptions and purchase intentions for the experimental groups, who watched vlogs about review of luxury products, were higher than control group, who did not watch vlog. Overall, results of this study found general support for PSI as a brand management tool as well as the use of social media to lead to positive luxury brand perceptions.