Saoirse Ronan had a voice whispering in her ear while working on the new sci-fi romance "The Host." And it wasn't the film's director.
Ronan plays Melanie, a young woman whose body has been taken over by an alien, known as Wanderer (Wanda for short). The two end up sharing a body, which meant most of the time during filming the Irish actress was talking to herself.
Ronan recorded the lines for the alien, which were played back to her through a tiny earpiece.
She laughs, saying that part was easy because she tends to chat with herself anyway.
Dealing with technological issues was just one of the demands of the role.
First, Ronan had to make both sides of her character come across as different as possible. She accomplished this through body language and using two American accents one slightly Southern, the other more Middle America.
Once she found the right voices, there were the physical demands that come with making a sci-fi tale. That part was easier because Ronan had made the physically demanding 2011 release "Hanna," which prepared her for stunt work. It was the "Hanna" film that convinced "The Host" producers that Ronan could handle the demands of the role.
If stardom comes, the actress is ready. Despite being only 18, Ronan has worked as an actress half her life and already has an Oscar nomination for her work in "Atonement."
She believes that she is up to the challenges that fame might bring: "If you are in love with the work, and working, then you won't get swept up in it."