Madam X is an American hard rock band first active in glam metal during the 1980s. Originally formed by two sisters, Maxine and Roxy Petrucci, the band also featured male members John (Jayme) Grosjean, Bret Kaiser and Chris Doliber, and later included future Skid Row vocalist Sebastian Bach. Disbanding in 1988, the group reformed briefly in 1991, and has become active again after reforming for a second time in 2013. The band released a new album, Monstrocity, on October 31, 2017.