Live, two-hour season finale, when either Fantasia or Diana takes the crown! The winner of American Idol season 3 is .... FANTASIA BARRINO!!!!
| Name | Type | Role | |
|---|---|---|---|
| Kelly Clarkson | Guest Star | ||
| Guy Sebastian | Guest Star | ||
| Jennifer Hudson | Guest Star | ||
| Latoya London | Guest Star | ||
| Matthew Rogers | Guest Star | ||
| Amy Yasbeck | Guest Star | ||
| Jon Peter Lewis | Guest Star | ||
| George Huff | Guest Star | ||
| Leah LaBelle | Guest Star | ||
| Amy Adams | Guest Star | ||
| Camile Velasco | Guest Star | ||
| Tamyra Gray | Guest Star | ||
| Ray Romano | Guest Star | ||
| John Stevens | Guest Star | ||
| Kimberly Caldwell | Guest Star | ||
| Henry Winkler | Guest Star | ||
| Jasmine Trias | Guest Star | ||
| Sharon Osbourne | Guest Star | ||
| Bruce Gowers | Director |