It turns out that Ashlee's a fucking hypocrite as well.
From IMDB;
Ashlee Simpson Owns Up To Lip-Syncing
Ashlee Simpson has owned up to lip-syncing, following an embarrassing Saturday night slip-up on live TV. The brunette singer, younger sister of Jessica Simpson, made an appearance on long-running comedy show Saturday Night Live, where she performed her hit single "Pieces Of Me." But when she was due to sing "Autobiography" track later on in the show, a pre-recorded track of her voice singing Pieces of Me began playing while Simpson was holding her microphone to the side and had her mouth closed - forcing her to exit the stage. And while she initially blamed her band for the incident, she now writes on her website that her voice was overworked. She says, "I'll hold my head high and say I think it was silly of me to do it, silly of me to blame the band, I was just so f**king embarrassed. But I don't think it did me much harm, and people will see that soon." A Saturday Night Live spokesperson says Simpson had planned to use a backing track, a common concert aid which allows singers to either mime or sing along with a guide-vocal track, to augment her voice. A statement from Simpson's record label blamed a "computer glitch" which triggered "a cut from her album" to play instead of a drum cue. The blunder has been all the more embarrassing for Simpson, because she recently expressed her disapproval of lip-syncing in an interview with Lucky magazine, explaining, "I'm totally against it and offended by it. I'm going to let my real talent show, not just stand there and dance around. Personally, I'd never lip- sync. It's just not me."
I think this site has the video, but I'm not 100% sure.
http://www.ebaumsworld.com/ashlee-snl.html