Demi Lovato Brings Ashlee Simpson Onstage for Surprise Performance of ‘La La’: Watch

Watch Ashlee Simpson’s Surprise Performance Of Her 2004 Hit La La With Demi Lovato!

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