Kendrick was slated to star in Braff's new Kickstarter-funded project Wish I Was Here alongside Kate Hudson, Mandy Patinkin, Jim Parsons and Donald Faison, but had to pull out due to other filming commitments.
The Scrubs funnyman has now revealed Kendrick's friend Greene has been brought in as a replacement.
In an email to the movie's online backers, which was sent out on Tuesday night (16Jul13), Braff writes, "Well, since you're having your first shot as being (a) movie producer, it's time you experience something that happens a lot: Scheduling conflicts. We've tried our hardest, but we've been unable to figure out the lovely Anna Kendrick's scheduling conflicts with another movie she's doing... You may know Ashley from Twilight. I've known Ashley for a couple years now and I'm so excited she's accepted my invitation to join our Kickstarter Klub (sic). Not only is Ashley gorgeous and charming, but she is hilarious, a very good actress and normal and cool and we are so lucky to have her."
Braff used crowd-funding website Kickstarter.com to raise $3.1 million (£2 million) in donations to make the film, which is a sequel to his 2004 movie Garden State.