Video: Beyonce's Flawless Unplugged Performance at 'Idol' Backstage

Not only did Beyonce Knowles deliver a stunning performance on "American Idol" stage but she also showcased a flawless vocal performance while doing a backstage rehearsal. The R&B diva is inside his dressing room with her entourage when she crooned the ballad track in a stripped-down performance. 

The rehearsal video which made its way out a day after the star-studded result show of the singing competition's finale reportedly was filmed by Beyonce's hubby Jay-Z using only a simple camera phone. Along with the footage, a short message was posted to explain that the performance is 100% unplugged. 

"Sometimes you need perspective," the message read. "You've been right in front of greatness so often that you need to step back and see it again for the first time. This is the dressing room rehearsal for American Idol. NO MICROPHONE. No effects."