She may be one of the biggest stars on the planet but Kristen Stewart has admitted that working in Hollywood isn't all glitz and glamour – especially if you happen to be a woman.

Speaking to Glamour magazine, the 25-year-old slammed the film industry as "disgustingly sexiest", claiming that female actresses are constantly faced with more barriers than their male counterparts.

"Women inevitably have to work a little bit harder to be heard," Stewart said. "Hollywood is disgustingly sexist. It's crazy. It's so offensive it's crazy."

Stewart, who stars in Oliver Assayas' acclaimed Clouds of Sils Maria, also admitted that she did not understand why many established actresses choose to go topless.

"I ... question when a fairly established actress finally does a scene in a movie when she shows her boobs, and she hasn't done it up until [that] moment," she said. "And maybe she only did it for the prestigious part and it's OK for this time because it's classy, and I'm like, 'Oh God, thank you for revealing to the world your treasure'."

Having rose to fame as Bella Swan in the Twlight franchise, Stewart also revealed that while she is comfortable in her on skin, she personally struggles with getting nude on screen.

"I only hate them when they're contrived. That's when it's grotesquely uncomfortable," she said. "On Twilight, we had to do the most epic sex scene of all time. It had to be transcendent and otherworldly, inhuman, better sex than you can possibly ever imagine. We were like, 'How do we live up to that?' It was agony. Which sucks, because I wanted it to be so good."

Despite amassing a fortune worth an estimated $70m (£45m), the brunette beauty has no time for pointless fame.

"Fame is the worst thing in the world. Especially if it's pointless. When people say, 'I want to be famous' Why? You don't do anything."

Stewart's criticism comes just months after Patricia Arquette used her acceptance speech for Best Supporting Actress to deliver a make a passionate plea for equal pay and rights for women.

"To every woman who gave birth to every taxpayer and citizen of this nation, we have fought for everybody else's equal rights," the mother-of two said during her rousing speech.

"It's our time to have wage equality once and for all, and equal rights for women in the United States of America."