Click here to see Kendrick's announcement.
Fans can enter the contest via DubSmash, a popular smartphone app. Entrants must find the "PitchSmash" section, and record a clip of themselves performing their favorite 10-second soundbite from the movie. They must then upload the app to Vine, Instagram or Twitter using the hashtag #PitchSmash.
The winner of the contest will earn a walk-on role in the third installment of the "Pitch Perfect" movie series. Ten runners-up will receive the first and second movies on Blu-ray.
The winner of the contest will be announced on "Good Morning America" Sept. 22, the same day "Pitch Perfect 2" will be released on DVD and on-demand.
"Pitch Perfect 3" is set for release in summer 2017.
