On tonight’s exciting performance show, the last of the season, Taylor Hicks & Katharine McPhee will battle it out live at the famed Kodak Theatre in Hollywood. One will be the next American Idol and one will go home. This week's theme: Songs from previous episodes & Kat & Taylor's debut singles. Performing tonight: Taylor Hicks and Katharine McPhee.
| Name | Type | Role | |
|---|---|---|---|
| Daniel Powter | Guest Star | ||
| Ben Stiller | Guest Star | ||
| Brad Hicks | Guest Star | ||
| Mandy Moore | Guest Star | ||
| Peisha McPhee | Guest Star | ||
| Sasha Cohen | Guest Star | ||
| Linda Hicks | Guest Star | ||
| Christina Applegate | Guest Star | ||
| Dan McPhee | Guest Star | ||
| Chris Daughtry | Guest Star |