*A slimmed down Chaka Khan – in a catsuit – took the stage at last night’s “American Idol” finale to sing with the six female finalists, while Fantasia – also in a catsuit –   joined  “Mantasia” to bring the house down with an Elton John classic, and eventual runner up Jessica Sanchez got a chance to get her “ugly face” on with Jennifer Holliday.

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The top 6 girls– Sanchez, Elise Testone, Hollie Cavanagh, Skylar Laine, Shannon Magrane and Erika Van Pelt–performed a medley of hits from Chaka Khan and were later joined by the diva herself for “I’m Every Woman.”

Khan, celebrating a recent 60 pound weight loss, wore a body-hugging one piece that showed it off. Watch the performance below.

Third place finisher Joshua Ledet got to see a dream realized when Fantasia joined him on stage for a rousing gospel-enhanced version of Elton John’s “Take Me To The Pilot.” The headline this morning, however, is less about their performance and more about ‘Tasia’s outfit and Pocahontas weave. Watch below.

One of the more memorable moments was a duet of “And I Am Telling You I’m Not Going” featuring eventual runner up Sanchez and her own personal idol Jennifer Holliday, who made the song famous in 1981 as the original Effie in Broadway’s “Dreamgirls.” Holliday fans already know she can make some strange faces while pushing out those powerful notes.

Below, we asked Sanchez what it was like to perform with Holliday, and whether or not she was thrown by those facial expressions.  [Scroll down to watch the performance.]

Below, Rihanna performs her latest single “Where Have You Been” and Jordin Sparks teams with finalist Hollie Cavanaugh for “You’ll Never Walk Alone.”