Recurring Guest Characters Derek Hough 4 guest appearances Hayley Erbert 3 guest appearances Julianne Hough 3 guest appearances Chloe x Halle 2 guest appearances Katy Perry 2 guest appearances Adam Lambert 2 guest appearances Adam Jacobs 1 guest appearances Alan Bersten 1 guest appearances Anika Noni Rose 1 guest appearances Ben Platt 1 guest appearances Billy Eichner 1 guest appearances Caissie Levy 1 guest appearances Christina Aguilera 1 guest appearances Donald Glover 1 guest appearances Emma Slater 1 guest appearances Halsey 1 guest appearances Heather Headley 1 guest appearances Idina Menzel 1 guest appearances Jenna Johnson 1 guest appearances Jennifer Hudson 1 guest appearances ⇤ « 1 2 3 4 5 6 » ⇥