The actor revisited his beloved character more than 20 years after Elf first premiered.
The comedian is one of many stars in the musician's upcoming Roku show.
All proceeds from the Oct. 26 show in Chicago will benefit the charity Cancer for College.
Will Ferrell is also joining the late-night host for his last show later this month.
When LNX replied to the fan question "Where is Will's Hand?," one headline took his cheeky response literally. "This why i can't joke around on twitter no more lmaoo."
