The Atlantic Wire reports Hudson will be cast in the movie as Braff's wife.
Last month, the "Garden State" star launched a Kickstarter campaign to fund his self-written film so he wouldn't have to make any creative sacrifices.
Braff, who sought to collect $2 million in 30 days, met his goal only four days after launching the campaign.
Mandy Patakin and Josh Gad have also joined the cast of the film.
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Kate Hudson is the latest celebrity to announce she'll be joining Zach Braff's upcoming project, the film "Wish I Was Here."
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