UPDATE: Seacrest indeed made it to the show and is on-air hosting Idol.

PREVIOUS: Can anyone imagine American Idol without host Ryan Seacrest? Fox and the show’s producers faced that possibility today with Seacrest sidelined by illness. According to TMZ, the host had been throwing up and couldn’t attend the dress rehearsal, which was emceed by Idol executive producer Nigel Lythgoe.¬†Idol producers have been scrambling today to find a backup for Seacrest. I hear they tried to get Cat Deeley, host of Fox’s So You Think You Can Dance, to sub for him, with Lythgoe also on standby. Meanwhile, there are strong indications that despite his illness, Seacrest, who just closed a new two-year deal for Idol, will still make it on stage as he has for every episode in the show’s 11 seasons to date.