A star-studded lineup of musical guests like Cher and Barry Manilow warmed up the crowd gathered on a very cold night for “Christmas in Rockefeller Center ... moved to 30 Rock, Kelly Clarkson ...

On Christmas Eve, it will be lit for 24 hours, and on New Year's Eve, it will be lit from 5 a.m. to 9 p.m. It's located at 30 Rockefeller Center between West 49th and West 50th streets in Manhattan.