Studio executives were so impressed by early footage of her as Maria in Spielberg's musical remake, they jumped at the chance to hire her.
Zegler beat out more then 30,000 actresses to land the role in "West Side Story" and it looks like her auditioning days are well behind her.
After the Snow White casting news was made public, the delighted actress tweeted in all caps, "I HAVE MANIFESTED MY ENTIRE LIFE I THINK I THINK (sic)."
She also shared a video on social media of her meeting the character at a Disney theme park, with the caption, "homegirl we have LOTS to catch up on (sic)."
"500 Days of Summer" filmmaker Marc Webb is directing the as-yet-untitled Snow White movie musical.
"Rachel's extraordinary vocal abilities are just the beginning of her gifts. Her strength, intelligence and optimism will become an integral part of rediscovering the joy in this classic Disney fairy tale," Webb said in a statement to Deadline.
Disney officials have been developing its live-action "Snow White" since 2016. Benj Pasek and Justin Paul, the songwriting team behind songs from "La La Land", "The Greatest Showman", and "Dear Evan Hansen", will write new music for the film.
Production is expected to begin in 2022.