The two primary objectives of the present study were to (a) investigate mothers' and fathers' reports of their own as well as their partner's parenting styles, and (b) assess how mothers' and fathers' parenting styles uniquely and jointly predicted toddlers' externalizing, internalizing, and adaptive behaviors. Fifty-nine mothers and fathers independently completed the "Parenting Styles and Dimension Questionnaire" (PDSQ; Robinson, Mandleco, Olsen, & Hart, 2001) and the "Behavior Assessment Scale for Children-2" (BASC-2; Reynolds & Kamphaus, 2004). Parents' self-reports of their parenting styles were positively correlated with each other for all three parenting styles (authoritative, authoritarian, and permissive). Comparisons between parents' reports of their partner's styles with that of the partner's self-reports were positively and moderately correlated for all three parenting styles. Findings revealed mothers' and fathers' self-reported parenting styles explained 44% of the variance in youngsters' externalizing behaviors. In particular, permissive parenting by mothers and authoritarian parenting by fathers uniquely and significantly predicted toddlers' externalizing behaviors, while authoritative paternal parenting was predictive of adaptive behaviors. (Contains 5 tables.)