Does Mariah Carey know Jennifer Lopez yet? Carey told the Watch What Happens Live audience whether or not she knows her peer yet. Mariah Carey, the elusive chanteuse, did not evade a question about whether or not she currently knows Jennifer Lopez, whose presence has allegedly eluded her over the years. Cohen previously brought up the meme in 2016, when he told Carey he ran into Lopez at an event and asked her about Carey. "She says you know her," Cohen told Carey, who responded, "Okay, you know what?