Santa and Kermit the Frog join the festive fun at the White House

With Santa in their midst, and Kermit the frog perched on the first lady's shoulder, the Obamas sing a rousing rendition of Walking in a Winter Wonderland.

The famous muppet provided festive cheer by the bucketloads as the US leader and his family lit up the National Christmas Tree in the grounds of the White House.