Adam Lambert on David LettermanAdam Lambert chose to close out his scandal-filled week with a subdued performance on 'Late Show with David Letterman.' The singer, who came under fire for his sexed-up performance at this week's AMAs, stripped down the sound on 'What Do You Want From Me.'

There was no kissing, no crotch grabbing, just Adam Lambert doing what he did best on last season of 'American Idol' ... raising the roof with his voice. Watch the performance: