"I don't know her" is a phrase coined by American singer Mariah Carey in response to a circa 2003 question about her thoughts on American singer Jennifer Lopez, whom media outlets perceived as her rival at the time. Carey's reaction, in which she shakes her head and smiles while stating "I don't know her", became a popular Internet meme and GIF. Due to its subsequent use by other celebrities, Vanity Fair deemed mid-2016 "The Summer of Not Knowing".
When asked about Lopez, Carey identified herself as a singer and denied an ongoing feud. After stating "I don't know her", she employed the expression over the next two decades. Carey contends it is not an affront to Lopez because she does not know her personally; Lopez herself says they do not know each other.