Here is the full list of celebrity cameos:
Dexter Mayfield, Chester Lockhart, Hayley Koiko, Jesse Tyler Ferguson, Laverne Cox, Justin Mikita, Todrick Hall, Ciara, Hannah Hart, Bobby Berk, Adam Rippon, Tan France, Karamo Brown, Antoni Porowski, Jonathan Van Ness, Ellen DeGeneres, Adam Lambert, RuPaul, Billy Porter, Ryan Reynolds and Katy Perry