Ripa serenaded the judges with a rendition of Peggy Lee's "Why Don't You Do Right," which Perry struggled to review.
"I just want to say that that was different. It was special," Perry said while trying to let her down gently. "Something we've never heard before. I don't really know how to define it, so I'm just going to leave it at that."
Watch the clip below to find out how the other two judges reacted.