The 24-year-old actress ended up breaking into a rendition of Cher's "Believe" while she and host Conan O'Brien were discussing "The Hanging Tree", a song from "The Hunger Games: Mockingjay - Part 1", reported Ace Showbiz.
"First of all, if I had gone 'Hunger Games', it would have reached number one," said Lawrence, who appeared on the show with her "The Hunger Games: Mockingjay - Part 2" co-stars Josh Hutcherson and Liam Hemsworth.
She went on revealing that singing in front of people was actually her biggest fear.
"Mockingjay - Part 2", which will be the last "The Hunger Games" movie, is scheduled to hit theatres on November 20.