Ariana Grande, Cynthia Erivo, Chappell Roan and Sarah Michelle Gellar will be guest judges on 'RuPaul's Drag Race All Stars'

'Wicked' stars Ariana Grande and Cynthia Erivo join the likes of Chappell Roan and Sarah Michelle Gellar as guest judges on 'RuPaul's Drag Race All Stars' season 10.