Kristen Stewart cried on the set of Eclipse according to the film’s director David Slade as she struggled to get to grips with her character.
The actress returned to the role of Bella Swan in the third movie in the Twilight franchise but found it difficult to relate to her character.
Speaking to the Vancouver Sun the filmmaker said: "[Kristen] would say, 'I don't know who Bella is to me.'
“In a lot of ways, I think she felt Bella was the antithesis to her, which presented a lot of challenges for Kristen…
“She would beat herself up about it, because she wants to be there. She never wants to leave a scene undone.
"Kristen, in particular, was very tough on herself," Slade explained. "Even in rehearsals with Rob, there was a similar spiralling that would happen."
Despite Stewart’s struggles the movie went on to be a big box office success this summer as it grossed over $692 million.
And she will reprise the role of Bella for one final time as filming on Breaking Dawn is already underway.
The final chapter in the Twilight Saga is set to be split into two movies, the first hitting the big screen in November 2011.
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