Mariah's World Mariah Carey shades Demi Lovato and Ariana Grande and claims she doesn't know them 12/19/2016 Mariah Carey says she doesn't know who Demi Lovato and Ariana Grande are. Read More RELATED NEWS Mariah Carey "inspired" by fans after her bipolar disorder announcementMariah Carey reveals struggle with bipolar disorderMariah Carey and Bryan Tanaka cozy up at Golden Globes after-party TAGS: Mariah Carey Jennifer Lopez Demi Lovato Ariana Grande Andy Cohen James Packer
