Gemma Arterton broke Famke Janssen's ribs while shooting their new movie.

The pair star together in 'Hansel & Gretel: Witch Hunters' and the the 27-year-old actress was shocked when she realised the damage she had caused her co-star during filming of the fantasy action adventure.

She said: ''I cracked Famke's ribs in a fight [scene] we did. ''She didn't tell me at the time, she was very good about it. Afterwards she said, 'You broke my rib!' Things like that happen.''

Gemma - who stars in the film with Jeremy Renner, playing adult versions of the classic fairytale characters who have grown up to become bounty hunters - didn't escape filming unscathed, and admits she was ''bruised and battered'' as a result of putting her all into scenes - and relied on pain reliever Arnica to get her through the physical aspects of the movie.

She added in an interview with DigitalSpy: ''I remember just overdosing on it. Even if you're just doing a punch, your neck can get thrown out. It was sort of a gauge of how hard you worked that day if you couldn't move the next day!''