For Mariah Carey, one casual comment from 2003 turned into a pop culture treasure chest, endlessly revisited and replayed. Her unforgettable “I don’t know her” about Jennifer Lopez. So I don’t know how it became so big. “‘I don’t know her’ forever ICONIC!!! A History of “I Don’t Know Her”For context, Carey first dropped the now-legendary comment in 2003 during an interview with the German show Taff.