The Oscar winner admitted to David Letterman on his `` Late Show '' on Wednesday that she has a huge fear of singing in front of other people , and it all goes back to the time she sang a holiday song in front of her school as an 8-year-old . ` Jennifer Lawrence butchered Christmas carols on David Letterman 's show . Comment: She proved it by singing `` Have a Holly Jolly Christmas ''
Jennifer Lawrence butchered Christmas carols on David Letterman 's show . Comment: She proved it by singing `` Have a Holly Jolly Christmas ''