A friend of Olsen says, "Mary-Kate absolutely adores Kate Moss.
"She was so worried about her when she went into rehab (for cocaine use) and she even wrote her a really nice letter offering her support and friendship."
The 19-year-old believes the two have a lot in common and are both "independent, free spirits."
The source adds, "Mary-Kate think that she would be able to bring the right edginess and depth to the role.
"She sees Kate as a survivor, just as she is herself."
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