Kristen who took up the offer to play Joan Jett in 'The Runaways

Hollywood actress Kristen Stewart who took up the offer to play Joan Jett in 'The Runaways' had to face difficulty during singing in the movie.

The 19-year-old actress knew she wanted the role of rocker Joan in the movie, but had problems with the singing aspect of the film, reported contactmusic.com

'I said that I wanted to do it as soon as someone said, 'There's a Joan Jett movie, and they want you to play her.'

'The most difficult thing was the performances, because I'm not a performer. The singing stuff, you learn so much about yourself. I don't know how to be more specific about it,' she said. 

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~Robstenfan