Elmo by Richard Termine/Sesame Workshop Elmo by Richard Termine/Sesame Workshop
Ben Stiller (voicing an elf named... Stiller) and

The Sopranos' Tony Sirico and Steve Schirripa (as a wannabe Bert and Ernie) are but a few of the stars who will help out with Elmo's Christmas Countdown, a one-hour holiday special coming to ABC. Per the Hollywood Reporter, Jamie Foxx, Jennifer Hudson, Ty Pennington, Alicia Keys, Sheryl Crow and Brad Paisley are also set to appear as themselves to perform in musical numbers, while Big Bird, Grover, Oscar, Snuffie and the Count will be representin' for the "I've got someone's hand inside me" set.