Sienna Miller recently expressed her opinion on the wage gap in Hollywood in an interview with Vogue.

The 33-year-old "American Sniper" actress said she's gone as far as turning down a Broadway role due to how much less she would be paid compared to her male counterpart in the production, according to Vogue.

"It was a play with just two of us on stage and I was offered less than half of what he was going to be paid," Miller said. "If it was two men, it wouldn't probably happen. Sad, but I walked away.

"The producer ... wouldn't pay me within a million miles of what the male actor was being paid. And women always have to do more publicity than the men. The only way is to make a stand. We are going to have to make sacrifices to make change. I want to turn up and feel dignified."

After last year's Sony Hack, the salaries of some of Hollywood's most well-known actors and actresses were exposed, showing how much less women were making than men. While Hollywood's highest paid actor, Robert Downey Jr., made $80 million per year, the highest paid actress, Jennifer Lawrence, only brought in $52 million.

Amy Pascal, former co-chairman of Sony Pictures, said women in the film industry should take a stance to try and change this practice by refusing jobs if they feel they're not being appropriately compensated for their work.

"They have to walk away," she said. "People shouldn't be so grateful for jobs."

Other women in Hollywood who have recently brought up the issues surrounding equal pay for women include Amanda Seyfried, Meryl Streep and Charlize Theron. "Snow White and the Huntsman" actress said when she felt the need to demand equal pay, she asked for it and actually received it, and she thinks other actresses should do the same.

"They did not fight it," Theron said. "And maybe that's the message: that we just need to put our foot down."