Seventeen-year-old Saoirse Ronan, the Oscar-nominated star of 'Atonement,' 'The Lovely Bones' and 'Hanna,' has been cast in the lead role in the adaptation of 'The Host,' 'Twilight' author Stephenie Meyer's bestselling novel about one girl's fight against an alien species, according to Deadline.

Andrew Niccol, the screenwriter behind 'The Truman Show' and director of 1997's futuristic 'Gattaca,' wrote the script and will likely direct the feature, which will be sold at the 2011 Cannes Film Festival later this month.

In 'The Host,' alien parasites called "Souls" invade human bodies and take over a person's consciousness. Ronan will play Melanie, who is captured by the aliens and implanted by a Soul called Wanderer. Wanderer attempts to get Melanie to give up the last remaining humans on Earth, but finds she is different from any other host in her unwillingness to give up her consciousness. He ends up attempting to connect with Melanie's old life.
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