This study introduced the concept of celebrity involvement, which described audiences’ relationship with mediated celebrities along three sub-dimensions—affinity, parasocial relationship, and identification. Based on the conceptualization, this study further examined the underlying mechanisms through which young people’s involvement with celebrities influenced their political and civic engagement. A survey of 248 undergraduate students in Macau, a Special Administrative Region of China, supported an indirect association of celebrity involvement and political and civic engagement, which was mediated by situational involvement and self-efficacy, respectively. Implications of the findings were also discussed.