This week, pop princess and movie star Jennifer Lopez will join the ranks of famous celebs to play mentor and guest star on American Idol. Tonight’s show will feature J Lo in mentor mode, coaching Idol wannabes on how to reach the high musical heights she has achieved…or, at least, get through this week’s competition. Lopez’s appearance and subsequent performance (scheduled for Wednesday night’s results show, where another Idol will leave the stage for good) coincide with a recent album release. There is no official word from FOX on what Lopez will perform or what tonight’s theme will be, but fans assume that a Latin-inspired evening is in the works. Will Sanjaya give crowds another rollicking performance? Will Haley Scarnato wear something incredibly revealing? Will Paula say something inane, while Simon reams competitors? It certainly wouldn’t be American Idol 6 otherwise, would it? Look for Lopez-coached performances tonight, before the diva herself takes the stage to show the Idols how it’s done during tomorrow’s live episode.

(You can find all the American Idol 6 posts here.)