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Caption:LONDON, ENGLAND - NOVEMBER 10: Jennifer Lawrence attends the World Premiere of 'The Hunger Games: Mockingjay Part 1' at Odeon Leicester Square on November 10, 2014 in London, England. (Photo by Anthony Harvey/Getty Images)
Caption:LONDON, ENGLAND - NOVEMBER 10: Jennifer Lawrence attends the World Premiere of 'The Hunger Games: Mockingjay Part 1' at Odeon Leicester Square on November 10, 2014 in London, England. (Photo by Anthony Harvey/Getty Images)

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J Law "sings" a duet with Letterman

"The Hunger Games" actress shows off her singing talents, explains her phobia on "The Late Show."

J Law "sings" a duet with Letterman

"The Hunger Games" actress shows off her singing talents, explains her phobia on "The Late Show."