When the show came back on, in the background I heard "It's on!" and Jude Law announced Ashlee Simpson. The band started playing and the vocals for the wrong song started (she must've been lip syncing), she did the Milli Vanilli dance, and walked off stage. WTF?
Edit: Here's a video of what happenedL http://www.collegehumor.com/news/ashlee_snl.wmv