Flashback: See Kesha Sing Led Zeppelin With Alice Cooper, Johnny Depp

When Hollywood Vampires, the supergroup featuring Alice Cooper, Johnny Depp, Joe Perry and Duff McKagan, among others, played their first gigs in late 2015, they invited some guest performers. One of the singers was Kesha. The pop star had previously duetted with Cooper on "What Baby Wants," a song on his...