Who? The attention-getting neo-glam rocker (and master of the high notes) who placed second in Season Eight.
Peak: Returning to Idol to deliver straitlaced, on-point criticism as the best mentor of Season Nine.
Low: An American Music Awards performance during which Lambert kissed an S&M-costumed male band member and grabbed the crotch of another. The risqué act was censored during the show's West Coast broadcast and drew outrage from many quarters.
Currently: A new album, Trespassing, is set to hit stores in March 2012.