Born in Salvaleón de Higüey on 26 August 1988, Kim and her siblings were abandoned by their mother at a young age; thereupon they were raised by their father and their paternal grandmother, who are of Calabrian origin, specifically from the Province of Cosenza.
She is a graduate of two Bachelor's Degree from Pontificia Universidad Católica Madre y Maestra, in Architecture and Fashion Designing.
She was crowned Miss Italia nel Mondo 2010, representing the Dominican Republic, June 30, 2010 at the "Palazzo del Turismo" of Jesolo.
Kimberly Castillo represented Higuey at Miss Dominican Republic 2014 in Santo Domingo and was crowned by outgoing titledholder, Yaritza Reyes.
[3][4] Kimberly represented the Dominican Republic at Miss Universe 2014, but failed to place between the semi-finalists.