Watch the trailer for 'Happy Christmas' starring Anna Kendrick & Lena Dunham.

A trailer has been released for Anna Kendrick’s new film, 'Happy Christmas', which also stars Lena Dunham.

"Irresponsible 20-something Jenny arrives in Chicago to live with her older brother Jeff, a young film-maker living a happy existence with his novelist wife Kelly and their two-year-old son. Jenny's arrival shakes up their quiet domesticity as she and her friend Carson instigate an evolution in Kelly's life and career. Meanwhile, Jenny strikes up a rocky relationship with the family's baby sitter-cum-pot dealer."

Watch the trailer below…