Emily Blunt channels her inner Janis Joplin as she performs "Piece of My Heart" in the final round against Anne Hathaway and her earth-shattering rendition of "Wrecking Ball."
Emily Blunt channels her inner Janis Joplin as she performs "Piece of My Heart" in the final round against Anne Hathaway and her earth-shattering rendition of "Wrecking Ball."