In this study, we tested two competing explanations of the previously established link between early female puberty and sexual harassment in early adolescence. The sample included 680 seventh-grade Swedish girls (M[subscript age] = 13.40, SD = 0.53). Findings revealed that looking more sexually mature and being sexually active mediated the link between pubertal timing and sexual harassment. The magnitude of the indirect effect through sexually mature appearance was greater than that through engagement in sexual behaviors. Apparently, early-maturing girls are sexually harassed as a result of natural and normative sexual development, which happens earlier than for most of their peers. The findings have clear implications for prevention of sexual harassment in adolescence.