Julianne Moore signing up to star in "The Hunger Games" franchise may have been surprising to many of her fans as she usually doesn't play roles that are geared to all age groups, especially towards young children.

Julianne Moore
Moore joined the 'Hunger Games' cast for her children

However, Moore recently revealed the motivation to star as President Coin in 'The Hunger Games: Mockingjay - Part 1 and Part 2,' was so because her own kids, Caleb and Liv, are big fans of the films and books.

"Most of the films I make are not for kids," the 53 year-old actress told the November issue of More magazine, who can be seen in the next 'Hunger Games' flick when "Mockingjay Part 1" hits theatres next month. "My son was in line for the midnight show when 'The Hunger Games 'first came out. They both loved the books. For them, my being in 'Mockingjay' was fairly meaningful."

More: The First Mockingjay Teaser Isn't The Trailer Fans Wanted, But The Trailer They Needed [Trailer + Pictures]

Another important part of joining the sci-fi franchise was to work alongside her very close friend Philip Seymour Hoffman, who she has starred opposite on three other movies. Tragically, Hoffman passed away in February, and Moore became very emotional when speaking about the late actor.

"It was a terrible, ridiculous, untimely loss. It's difficult because I'm not sure how his family wants to deal with all this. It's not my place," she said. "But I can talk about him as a colleague, he was an extraordinary talent and a lovely human being."

More: 'Maps To The Stars' May Finally Earn Moore An Oscar

The November issue of More hits newsstands Oct. 28.