Ashlee Simpson walked offstage this Saturday during a broadcast of Saturday Night Live when recorded vocals for a different song began to play as she began performing.

After Simpson and her band were introduced by guest host Jude Law, a recording of her hit song "Pieces of Me" -- a track Simpson had performed earlier in the evening -- began to play just as she appeared to be launching into another song. Within thirty seconds, Simpson had walked off, leaving NBC to cut immediately to a commercial. Simpson had intended to perform the title track of her debut album, Autobiography.

At the close of the show, Law stood beside Simpson and said, "What can I say? Live TV." And the singer, trying to explain the misstep, sweetly said, "My band started playing the wrong song."

Simpson, 20, came out from under the shadow of her older sister, pop singer and star of the reality show Newlyweds Jessica, when Autobiography debuted at Number One this summer. With a regular role as "Cecilia" on the WB hit Seventh Heaven and the instant success of her MTV reality series, The Ashlee Simpson Show, Simpson also proved herself to be a draw on the small screen. Autobiography has sold over a million copies.

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