Objective: To develop and validate a novel patient-reported measure to assess internally and externally driven expectations for change after a cosmetic procedure, termed the aesthetic procedure expectations (ASPECT) scale. Method: In total, 186 adults recruited from nonsurgical cosmetic clinics in Melbourne, Australia, accessed an online survey (150 completed; 81% response rate) including the novel ASPECT questionnaire, demographics, and measures of psychological distress. Results: The final sample included 141 women and 5 men with a mean age of 44.78 years (standard deviation = 11.68) with <10% missing data. Results supported a two-factor ASPECT scale measuring intrinsic and extrinsic expectations, with high internal consistency and convergent validity. Heightened extrinsic and intrinsic expectations were both associated with individuals who were emotionally distressed, younger, and had previously undertaken more cosmetic procedures. Cutoff scores for the ASPECT subscales are proposed to aid cosmetic practitioners in identifying clients requiring further assessment. Conclusions: The ASPECT scale may provide a reliable and useful clinical tool for cosmetic practitioners to assess unrealistic expectations and determine which clients may require more in-depth consultation before undergoing surgical or nonsurgical cosmetic treatment.