Taylor Swift is a busy girl these days! In addition to her packed touring schedule, she's also somehow been able to squeeze in time to write a song for a film soundtrack, which she dished on at the 2013 Toronto International Film Festival on Monday (Sept. 9).

Fans have been eager to learn more about Swift's brand new song titled 'Sweeter Than Fiction,' which she penned for the upcoming film 'One Chance,' based on 'Britain's Got Talent' winner Paul Potts. The song made its official debut at Monday's film fest, where the flick's premiere was held, playing in the closing credits.

From the sound of it, Swift is pretty excited to be on board. "Tonight= my first Toronto Film Festival experience - Going to the premiere tonight of 'One Chance,' honored to have written the end credit song!" she tweeted early in the evening.

Although the film is said to follow Potts' rise to fame, Swift has a different take on the film, and she wrote 'Sweeter Than Fiction' based on what she really feels the movie is about.

"I'm very inspired by the concept of love. And this movie is, in a lot of ways, a love story," she dishes. "You're expecting to go in and see a movie of someone who makes his dreams come true, but what you don't realize is you're actually being told a story of the love his wife ... has for him."

Adds the superstar, "That was the story that hit me and really affected me. I wanted to tell a story musically from that perspective."

Soon, everyone will be able to hear the song -- and see the story behind Potts' rise to fame and love story with wife, Julie-Ann. 'One Chance' will hit cinemas on Oct. 25, 2013.