Jennifer Lopez steals the show with her famous derrière on a star-studded American Idol

By DAILY MAIL REPORTER Stealing the show: Jennifer Lopez, left, dances as Marc Anthony performs at the American Idol finaleThe night belonged to Scotty McCreey, but even his vote-winning performance couldn't compete with the charms of Jennifer Lopez.With her husband Marc Anthony performing, the American Idol judge took the role of backing dancer, shaking her body in a revealing white flounced