American Idol (season 8) Guest performances Guest performances

| Week | Performers | Hot_100_Reaction | Hot_Digital_Songs_Reaction | Notes |
|---|---|---|---|---|
| Top 7 (week 2) | David Archuleta | did not debut | 107 (12,875 +558%) | live performance |
| Top 7 (week 2) | Freda Payne Thelma Houston KC | ineligible to re-enter | N/A | live performance |
| Top 5 | Natalie Cole | did not debut | N/A | live performance |
| Top 5 | Taylor Hicks | did not debut | N/A | live performance |
| Top 5 | Jamie Foxx | 2 (+2) | 4(+6) | live performance |
| Top 4 | Paula Abdul | 87 (debut) | 61(24,615 +999%) | pre-recorded |
| Top 4 | No Doubt | ineligible to re-enter | TBA | pre-recorded |
| Top 4 | Daughtry | 15 (debut) | 7 (103,593 +999%) | live performance |
| Top 3 | Noah Mushimiyimana | NA | NA | live performance |
| Top 3 | Jordin Sparks | 32 (debut) | 12 (75,007 +999%) | live performance |