Natalie Portman's 'Black Swan' Double Stands By Earlier Claims

Dancer Sarah Lane says the film's producers asked her to keep quiet about her role until after the Oscars.

It seems ballerina Sarah Lane isn't ready to drop her feud with the Black Swan filmmakers just yet.

Although Fox Searchlight, director Darren Aronofsky and actress Mila Kunis have all stepped forward to refute Lane's claims that Natalie Portman only did five percent of the dancing in her Oscar-winning turn in Black Swan, Lane refuses to back down.

In a new interview with ABC News' 20/20, the American Ballet Theatre star maintains that she was featured in most of the film's full body shots through a technique called "face replacement" that superimposed Portman's face onto Lane's body.

"Full body shots with actual dancing is me. That's why they hired me," Lane said.

She alleges that one of the film's producers asked her to keep quiet about the extent of her role in the movie after she conducted an interview with Glamour Magazine for a piece called "The Real Black Swan."

"He asked if I would please not do any more interviews until after the Oscars because it was bad for Natalie's image," Lane said. "They were trying to create this image, this facade, really, that Natalie had done something extraordinary. Something that is pretty much impossible ... to become a professional ballerina in a year and half."

However, Black Swan editor Andy Weisblum tells 20/20 that Lane is overstating her responsibilities.

"There are about 35 shots that are full body shots in the movie. Of those 35 shots, 12 are Natalie, and then the rest are Sarah," he said. "But over the overall film, Natalie did a lot more than that."

Controversy erupted earlier this year when Lane spoke out about her part in the film, claiming filmmakers had lied about Portman's abilities in order to draw favor during awards season.

She insists that Portman couldn't possibly have accomplished so much in the short amount of time she had to work with, repeating her argument that to suggest otherwise "is degrading not only to me but to the entire ballet world."

"It really hurts for someone to say that they got a personal trainer and they became what I spent blood, sweat and tears doing every day, all my life, in just a year and a half," she said.

However, she adds that there's no bad blood between her and Portman, who has yet to address the issue directly.

"I think she is a really beautiful actress," Lane said. "I loved working with her."