“Live” counts down the hours to Christmas with “Kelly and Ryan’s Christmas Eve.” RYAN REYNOLDS previews “6 Underground” and joins in on the celebration with a holiday game. Kelly and Ryan speak with LACEY CHABERT about the Hallmark Channel movie “Winter in Vail.” World-famous RADIO CITY ROCKETTES® and a cappella group PENTATONIX perform holiday hits, and Kelly and Ryan welcome Old Saint Nick himself, SANTA CLAUS.