-"American Idol" will crown it's 18th winner tonight , with all star performances .
-Katy Perry will perform her new song"Daisies". Luke Bryan will perform"One Margarita"
-Cynthia Erivo will perform a Melody of Aretha Franklin songs just in time for her starring turn as the legendary singer on National Geographic's "Genius" mini series, which begins airing on May 25th. Erivo will be joined by the top 11 contestants.
-Lionel Richie will perform "We are the World" with Idol alums, including winners Fantasia,Ruben Studdard, Jordin Sparks,Phillip Phillips,Scotty Mccreery, as well as famous contestants such as Kathrine Mcphee,Kelli Pickler and more.
Promo under the Spoiler cut
[Spoiler (click to open)]