LOS ANGELES (CBSLA.com) — Days after Jennifer Lawrence sounded off about the gender pay gap in Hollywood, other actors are weighing in.

“One thing I could say is that’s interesting because, yeah, if you think that you only deserve a certain amount and that’s not correct, it’s about changing that mindset and sticking up for yourself,” Bradley Cooper told E! News.

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“So, that’s a great thing,” said Cooper. He indicated, though, that he hadn’t read the essay.

He and Lawrence were co-stars in the film, “American Hustle.”

Lawrence had wrote in a powerful essay in Lena Dunham’s weekly newsletter, Lenny, that she wasn’t upset with Sony after learning that she made less than her male counterparts in the film “American Hustle.”

Rather, she said, she was mad at herself, stating that she didn’t negotiate hard enough.

“I didn’t want to seem ‘difficult’ or ‘spoiled.’ At the time, that seemed like a fine idea, until I saw the payroll on the Internet and realized every man I was working with definitely didn’t worry about being ‘difficult’ or ‘spoiled,’ ” she wrote.

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Lawrence in the piece went on to question: “Are we socially conditioned to behave this way? Could there still be a lingering of trying to express our opinions in a certain way that doesn’t ‘offend’ or ‘scare’ men?”

“I think little girls have been conditioned to not demand as much,” said Kathy Spillar, The director of the Feminist Majority Foundation.

“Good for her for, one, looking at what she could have done differently, but also calling out the studios and the employers for taking advantage,” Spillar told CBS Los Angeles earlier this week.

Spillar says speaking up pays off for women.

“We’re told, ‘a woman is her own worst enemy’ and all of those mythologies. But , in fact, the research shows that women who speak up and demand equal treatment are the ones who get ahead,” she said.

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Along with Cooper, stars like Emma Watson and Jessica Chastain also weighed in, PEOPLE magazine reported: