| Episode cast overview, first billed only: |
 | Ryan Seacrest | - | Himself - Host / Himself - Countdown Guest |
 | Giuliana Rancic | - | Herself - Hostess / Countdown Hostess |
 | Ross Mathews | - | Himself - Host / Himself - Countdown Guest |
 | Tinashe | - | Herself - Host |
 | Kris Jenner | - | Herself - Countdown Host |
 | Brad Goreski | - | Himself - Countdown Host |
 | Kristin Cavallari | - | Herself - Countdown Host |
 | Zuri Hall | - | Herself - Countdown Correspondent |
 | Sibley Scoles | - | Herself - Countdown Correspondent |
 | Will Marfuggi | - | Himself - Correspodent |
 | Jessica Stam | - | Herself - Stylist |
 | Alaska Thunderfuck | - | Himself - Coundown Guest (as Alaska) |
 | Brian McCook | - | Himself - Countdown Guest (as Katya) |
| Sergio 'Sexy Sax Man' Flores | - | Himself - Countdown Guest (as Sexy Sax Man) |
| Anita Patrickson | - | Herself - Stylist |
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