Bing Crosby once said the most difficult thing he ever did in his decades-long career was sing "White Christmas" to homesick ...

The legendary crooner, who first sang the song that reminisces about snowy childhood Christmases, once told his nephew, Howard Crosby ... Bing performed for the troops, he refused to wear his toupee.

For soldiers in France listening to Bing Crosby sing "White Christmas ... I'm not going to wear anything phony like a toupee. Forget it.’ So he went onstage without a toupee for the troops ...