Ashlee was appearing as a guest host of the show and also performed two songs.
At the end of the show, Ashlee claimed that it was her band's fault, saying that they'd started "playing the wrong song," and she didn't know what to do.
Since then, however, Ashlee hasn't said a word about the incident which many have suggested signalled the demise of her career.
That is until now. Because Ashlee is making a comeback with a reality TV show and has decided to finally address the fail a full 14 years after it first happened.
Speaking to E!, Ashlee revealed that the whole scandal made her "stronger" and a "better performer."
And she went on to say that she's come so far since the incident.