Question: Who is the director of the film that featured the song "What If" by Colbie Caillat on its soundtrack?
Sentence (from "Letters to Juliet"): The idea for the film was inspired by the 2006 non-fiction book "Letters to Juliet", by Lise Friedman and Ceil Friedman, which chronicles the phenomenon of letter-writing to Shakespeare's most famous romantic heroine.
Relevant evidence: No