12/17/2013 12:55 pm ET

Will Ferrell Sings With The Vienna Boys Choir And Shows Them How It's Done

Will Ferrell has been making a lot of his recent late-night appearances as his "Anchorman" character, Ron Burgundy. This time, though, he showed up as himself to "Late Show." Still, he managed to crack us up when he talked about traveling with the Vienna Boys Choir while promoting "Anchorman 2: The Legend Continues."

To prove it, Ferrell brought the boys on stage with him for some Christmas carols. The Vienna Boys Choir has performed and recorded some of the most beautiful Christmas music ever heard, and their signature sound is the high voices of the young performers. When Ferrell joined the boys, he raised his own voice to match theirs ... and not just for the singing parts.

Ferrell stepped forward and addressed the audience directly -- talking in a ridiculous falsetto -- with sincere words about the holidays. Of course, his sincerity was lost in the gales of laughter.

Will Ferrell can next be seen in "Anchorman 2: The Legend Continues," opening in theaters nationwide on Wednesday. "Late Show with David Letterman" airs weeknights at 11:35 p.m. EST on CBS.

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