Saoirse Ronan "charmed and hypnotised" everyone on the set of 'Atonement'.
Ronan starred as teenager Briony Tallis in the 2007 romantic war drama.
Ian McEwan - who wrote the best-selling novel the film was based on - revealed how Saoirse wowed everyone on the set.
Saoirse was nominated for the Best Supporting Actress Oscar for her performance in the film.
Ian said: "Even then, she showed an extraordinary ability to take control of the material, to morph from a sparky Irish kid into an upper-class English girl with cut-glass accent to match.:?
Meanwhile, Saoirse revealed in February that she was tempted to bring her dog Fran as her date to this year's Academy Awards.