Michael Schneider / Variety: Ariana Madix, Dylan Efron to Host NBC's 'The Voice' Live Finale Pre-Show - "Vanderpump Rules" alum Ariana Madix and "The Traitors" contestant Dylan Efron have signed on to co-host NBC's live "The Voice" finale pre-show on Tuesday, Dec. 16. - The special will air that evening at 8 p.m. ET ...