J. Lo sends 'Idol' audience wild with performance critique

On "American Idol," Emily Piriz paid tribute to her Latin roots -- and to judge Jennifer Lopez -- with a performance of JLo's

"Let's Get Loud."

JLo said she loved the performance (she actually was lip-syncing throughout) but wished Piriz would have gotten a little more into it -- then demonstrated what she meant with a hard hair flip that sent the audience wild.

Harry Connick, Jr. said it was incredibly brave to take on the song, but thought Emily got lost in the big production.