Carrie Ann Inaba Len Goodman Paula Abdul Paul Hollywood Katy Perry Derek Hough Guest Judges Carrie Underwood Bruno Tonioli Craig Revel Horwood Reba McEntire Dancing With the Stars Judges Anna Delvey Mel B Keke Palmer Blind Auditions Maksim Chmerkovskiy Mentoring and Judging SYTYCD Rhys Nicholson Drag Royalty Coaches Padma Lakshmi Feedback Prue Leith Simon Cowell Panelists The Masked Singer Celebrity Detectives Nigel Lythgoe American Idol Judges Panel Heidi Klum Judging Panel Judge Mathis Comments and Feedback Judging Criteria Melissa Peterman Snoop Dogg