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BRADLEY COOPER and Sienna Miller weighed in on the pay-gap debate last night, showing support for Jennifer Lawrence's essay on the topic.The actors were promoting their new film, Burnt, and both agreed that women had to take a stand to ensure they were paid equally to men in Hollywood.

Entitled "Why Do I Make Less Than My Co-Stars?" the piece by Lawrence discussed the reasons behind the pay gap, asserting that women should take responsibility for their part in the discrepancy.

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"When the Sony hack happened and I found out how much less I was being paid than the lucky people with dicks, I didn't get mad at Sony.I got mad at myself," Lawrence said, in the letter for Lenny."I failed as a negotiator because I gave up early.I didn't want to keep fighting over millions of dollars that, frankly, due to two franchises, I don't need.But if I'm honest with myself, I would be lying if I didn't say there was an element of wanting to be liked that influenced my decision to close the deal without a real fight.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 realised every man I was working with definitely didn't worry about being 'difficult' or 'spoiled.'"

© Getty

© Getty

"I walked away from a play that I wanted to do because I was offered less than half of what the other man was offered and it was just the two of us," Sienna Miller told E!News, reiterating what she told November Vogue."I did what we have to start doing, unfortunately, at the expense of our creative dreams."

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Cooper was in complete agreement, adding:"One thing I could say is that's interesting because 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 the way that Sienna did.So that's a great thing."