The Top13 girls of American Idol Season 8 returned to perform on the finale. Megan Joy, Jasmine Murray, Alexis Grace, Lil Rounds and Allison Iraheta performed "Glamorous" by Fergie, who joins them to sing "Big Girls Don’t Cry" and later performs with the rest of the Black Eyed Peas "Boom Boom Pow", which was the lead single for their comeback album "The END" which went on to be a #1 hit single for them.