This research provides empirical support to the understanding of the consumers’ public self-consciousness and its impact on the luxury brand attachment. A self-administered survey questionnaire was distributed to an online consumer panel in Australia. The results show that both actual and ideal self-congruity positively influence the consumers’ luxury brand attachment. The impact of actual self-congruence on luxury brand attachment is stronger than that of the ideal self-congruence for privately consumed luxury products. The impact is non-significant for publicly consumed luxury products. Moreover, highly attached consumers tend to advocate the luxury brands to other consumers. The research also reveals that public self-consciousness does not moderate the relationship between consumers’ perceived self-congruence and luxury brand attachment. The results suggest that luxury brand advertisers should incorporate the consumers’ actual and ideal self into the advertising message to strengthen the attachment. Future research may validate the hypothesised relationships within different luxury product and service category to enhance the generalisability of the findings.