'Christmas in Rockefeller Center'(8PM, NBC)
Al Roker hosts and Tony Bennett, Harry Connick Jr., Beyonce, the Jonas Brothers, David Cook and Rascal Flatts perform, but the real star of this celebration is the 72-foot-tall Norway spruce that will stand in Rockefeller Center.
Tonight, Roker and the other celebs help flip the switch on the tree's thousands of multicolored lights, an event that officially marks the beginning of the holiday season in New York City.
In fact, this year's tree is such a symbol of the holidays that it's getting its own star: a 550-pound Swarovski crystal ornament that will serve as the tree's topper.
