This clash, which reportedly began in the late ’90s, has more to it than just differing personalities; it’s rooted in alleged career sabotage, interpersonal drama, and competition within the entertainment industry. Now, it seems Mariah Carey sees the current struggles Jennifer Lopez is facing as a form of “karma” finally catching up to her. One of the most notable episodes that fueled this rivalry occurred in the early 2000s when Mariah famously said, “I don’t know her,” in response to a question about Lopez.