This research identifies the relationship between consumption practices and the construction of social identity among tweens in a Brazilian context. Using consumer culture theory and social identity theory, we employed 80 h of observation, 9 interviews, and projective techniques with fifteen girls. Three social identity groups were acknowledged: naive, connected, and counselors. These groups revealed different identity projects, such as the integration and maintenance within the social group of current belonging, the access to the social group with the greater distinctions, the generation of differentiable and positive distinctions (both intra- and intergroups), and the expression and consolidation of identity and its respective consumption practices. This research contributes to the consumption literature that relates to consumer identity projects. The findings reveal a current resignification of girlhood and exposes tweens’ consumption practices as a direct mechanism of the expression and construction of their social identities. These are mechanisms of social identity construction as mediated by group relations through the processes of access, maintenance, integration, differentiation, and distinction.