Ray Tamarra / Getty Images North America 1 / 12
Ray Tamarra / Getty Images North America 1 / 12

Jennifer Lawrence is used to being surrounded by mobs of fans, but Wednesday provided a little more excitement and fright than even she's used to.

While leaving a taping of "The Late Show With David Letterman," J.Law stopped to sign autographs for a massive crowd that had gathered to get a glimpse of her.

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In the middle of signing autographs, a metal barrier toppled that had served as protection from the screaming fans. "The Hunger Games -- Mockingjay Part 1" star was quickly whisked away by her security team, getting her away from the chaotic scene.

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Prior to the scary moment, the Oscar winner faced another fear -- singing in front of a crowd. In the new "Hunger Games" J.Law sings "The Hanging Tree."

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"I do not like singing in front of other people, that's like my biggest fear," the actress told Letterman. "I cried on set that day [when I had to sing]. I'm scarred from my childhood."

Jennifer went on to a sing a semi-tone deaf version of "Holly Jolly Christmas" with the 
"Late Show" host.

She's won an Oscar, folks, not a Grammy.