Los Angeles - Kristen Stewart had to keep a swear jar on the set of The Twilight Saga Breaking Dawn - Part 1 to curb her "Tourettes".
The 21-year-old actress' character Bella Swan becomes a mother in the latest instalment of the vampire franchise, so she had a lot of scenes with a young child, leading her to make an extra - although not entirely successful - effort not to use curse words.
She told Empireonline.com: "I have, like, Tourette's syndrome. I get so mad sometimes if I can't get something. I have a child in Breaking Dawn and I constantly swear, so there is a swear jar on set that just I ended up paying into.
"Every single time she'd go, 'I know what you just said!' and I'd say, 'No, you didn't! You didn't hear that!' "
Now that filming has finished on the Twilight series, Kristen has moved onto other films, appearing in On the Road and Snow White and the Huntsman, which has seen her move a further out of her comfort zone to embrace more diverse characters.
Kristen - who is in a relationship with her Twilight co-star Robert Pattinson - added: "Well I have had a lot of experience playing very contemporary, very close to myself, relatable parts, but I find that I have to have that feeling even if it is placed in a different context such as Snow White which is fantastical.
"I'm not, at least not yet, a character actor. But the last few parts that I have played, like I just played Marylou in On the Road, were so completely different to who I am that it made me realise I can push myself a little more.
"I can probably do things that aren't within my comfort zone. Not that I try to stay there! It's just that when you are a particular person you connect to certain things."
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