Guest judges may occasionally be introduced. In season two, guest judges such as Lionel Richie and Robin Gibb were used, and in season three Donna Summer, Quentin Tarantino and some of the mentors also joined as judges to critique the performances in the final rounds. Guest judges were used in the audition rounds for seasons four, six, nine, and fourteen such as Gene Simmons and LL Cool J in season four, Jewel and Olivia Newton-John in season six, Shania Twain in season eight, Neil Patrick Harris, Avril Lavigne and Katy Perry in season nine, and season eight runner-up, Adam Lambert, in season fourteen. COUNT 8
QSN1 In what season was Lionel Richie a guest judge on American Idol? ANS1 season two QSN2 Which season eight contestant was a guest judge in season fourteen? ANS2 Adam Lambert QSN3 In what season was Donna Summer a guest judge on American Idol? ANS3 season three QSN4 In which season was Shania Twain a guest judge on American Idol? ANS4 season six QSN5 Which season of American Idol featured Katy Perry as a guest judge? ANS5 season nine QSN6 Who were the guest judges in season two? ANS6 Lionel Richie and Robin Gibb QSN7 When was Shania Twain a guest judge for auditions? ANS7 season eight QSN8 When did Donna Summer help the contestants during the final rounds? ANS8 season three