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Jennifer Lawrence has a lot more to say about the gender pay gap in Hollywood. The Joy star made a surprise appearance at the Ninth Annua...

Jennifer Lawrence Chants for Equal Pay During a Surprise Drop-In at the Women in Film Pre-Oscar Party

Jennifer Lawrence has a lot more to say about the gender pay gap in Hollywood.

The Joy star made a surprise appearance at the Ninth Annual Women in Film Pre-Oscar Party -- presented by Max Mara, BMW, M.A.C. Cosmetics, FIJI Water and Perrier-Jouët -- at Hyde On Sunset in West Hollywood, California, on Friday, where she was all smiles while continuing her fight for equal pay.

Dressed in a Dior Haute Couture embroidered off-white wool jacket and a black knitted silk dress, the 25-year-old actress took the stage with Women In Film LA president Cathy Schulma. Lawrence spoke right after Patricia Arquette gave a speech about her change.org/era petition, which was created to urge lawmakers to vote to ratify the Equal Rights Amendment.

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An insider tells ET that even though Lawrence delivered her impromptu speech flawlessly, she was a bit hesitant to go onstage at first.

"I'm a huge fan of Patricia Arquette," she explained to the crowd. "I actually played the younger version of her [on the crime show Medium]. I love that she stood up, for starting a conversation. We're getting dialogue going. I'm going to go home, and I'm going to go to change.org/era ... I'm going to that. Let's all do it."

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