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Katja Kassin's Diary: Teil: Crazy, Sexy, Juicy castlist matches that on Katja Kassin's Diary website. However the picture of Andere is Julia Crow and when you 'click' on the picture the hyperlink takes you to details for Julia Crow and also credits her in the film.
Therefore Andere = Julia Crow.

Just realised that andere is German for others (as in other members of the cast) which explains the hyperlink name (others) and reinforces that effectively Andere is Julia Crow.