Ashlee Simpson Returns to the Stage for "Lala" Performance With Demi Lovato

Watch Ashlee Simpson Make a Rare Return to the Stage to Perform With Demi Lovato

Ashlee Simpson Joins Demi Lovato Onstage For a Surprise Performance of Her Hit 'Lala'

Ashlee Simpson Makes Rare Return To The Stage To Perform ‘La La’ With Demi Lovato: Watch