"Si No Te Hubiera Conocido" (English: "If I Hadn't Known You") is a song by American recording artist Christina Aguilera and Puerto Rican singer Luis Fonsi. It was written and produced by Rudy Pérez for Aguilera's second studio album Mi Reflejo (2000). The song portrays two lovers who remember each other and cannot imagine their lives if they had not known each other. "Si No Te Hubiera Conocido" received mixed reviews from music critics for its ballad production. The song peaked at number 36 on the Billboard Hot Latin Songs chart in the United States.