(Cover) - EN Showbiz - Kristen Stewart is "marvellous" in her new Snow White movie because she "challenged" herself so much.

The actress is famed for her involvement in the Twilight franchise, where she played Bella Swan. That has now wrapped and she's happy to move on to new things.

Kristen has the title role in Snow White and the Huntsman, which is out later this year. The actress amazed her co-star Sam Claflin with how dedicated she was.

"She's really, really challenged herself physically, mentally, vocally - every sort of side of it. And she's very hard working," he told E! Online. "All I can say is she's pulled it off marvellously. I hope everyone agrees."

Sam is Prince William in the film and looked to Kristen for tips while they were shooting.

He was impressed with how she delved into the new role. Sam thinks she saw it as the perfect way to move on from Twilight, the last instalment of which hits screens worldwide from November.

"Working beside her on and off set, she really is very focused on sort of changing her life after Twilight," he said.

"The Twilight [films] are coming to an end now and she wants to set out a career that will take her to new places." (C) Cover Media