Cassadee-Pope-Avril-Lavigne Published December 18, 2012 at 600 × 400 in Watch: Avril Lavigne & Cassadee Pope Sing ‘I’m With You’ [VIDEO] THE VOICE — “Live Finale” Episode 323B — Pictured: (l-r) Cassadee Pope, Avril Lavgine — (Photo by: Tyler Golden/NBC)