Saoirse Ronan: 'How I Live Now' Portraits at TIFF 2013

Saoirse Ronan poses at the Guess Portrait Studio during 2013 Toronto International Film Festival on Tuesday afternoon (September 10) in Toronto, Canada.

The 19-year-old actress is promoting her new film, How I Live Now, at the annual festival.

PHOTOS: Check out the latest pics of Saoirse Ronan

How I Live Now, out in select theaters on October 4th, follow an American girl who, while on holiday in the English countryside with her family, finds herself in hiding and fighting for her survival as the third world war breaks out.