Seacrest said the show's format hasn't changed.
'American Idol' says it wants to get back to making stars →
I think it's to have a crushing performance in Times Square," Seacrest said. "I don't know if the idea was hers or ours, but it's a great idea, and so we're happy to have her back."
Seacrest says he's sure Carey won't miss NYE gig rehearsal →