18x176 - Late Show with David Letterman

Dave welcomes actor Tom Hanks and musical guest My Morning Jacket. He's brought his own mistletoe! Tom Hanks shares an intimate Christmas greeting with Dave's viewers. Don't miss the excitement as Tom Hanks unveils the trailer for his new Pop Tart HBO mini-series. My Morning Jacket performs "Outta My System" from their new release, "Circuital".