American Idol (season 8) Guest performances Guest performances

| Week | Performers | Hot_100_Reaction | Hot_Digital_Songs_Reaction | Notes |
|---|---|---|---|---|
| Top 3 | Katy Perry | 13 (+38) | 5 (103,921) +180% | live performance |
| Top 2 | Carrie Underwood | 79 (re-entry) | TBA | live performance on May 19, 2009 |