Tonight, Darlene Love performs “Christmas (Please Come Home)” with Paul Shaffer and the band on David Letterman. It’s the 20th year in a row that they’ve done it. So by the time Darlene finished the taping, she she was a little tapped out on that particular song when she arrived at the Rum Room at the Edison Hotel for some Christmas caroling in honor of the documentary “20 Feet from Stardom.”

How-ever: about a half hour after Darlene arrived and warbled with Lisa Fischer and Judith Hill, Shaffer himself came down to West 47th St. from the Ed Sullivan Theater. You can see the results right here: an impromptu version of the song with Shaffer on piano, Fischer and Hill backing him up, along with Glenn Close, Robert Wuhl, Richard Kind, Ilene Kristen, Paul Haggis, Rutanya Alda, and “20 Feet” director Morgan Neville. All you can say is “Wow!”…

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