Although the relationship between self-objectification and selfie-related behaviors has been extensively investigated, limited attention has been given to understanding how women's self-objectification impacts their attitudes toward peer selfies from the observer's perspective. This issue was addressed across four studies (N = 801). Specifically, Studies 1a and 1b (correlational research) revealed a positive association between women's self-objectification and hostile attitudes toward peer selfies. In Studies 2 and 3 (experimental research), a causal relationship was established, such that women with higher levels of state self-objectification were more inclined to attach negative tags to other women's selfies. Notably, perceived attention-seeking motivation plays a mediating role in the process (Studies 1b, 2, and 3). Furthermore, these effects occurred not only in response to selfies taken by highly attractive women but also in response to targets who are moderately attractive or average-looking (Study 3). These findings bridge a significant gap in the field of self-objectification and social interaction on social media.