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Rachel Bilson and her real-life beau Hayden Christensen were hard at work (yeah, right) yesterday in NYC on the set of their upcoming film Je T'aime, New York.

It's "an anthology film, joining several love stories," according to IMDB. Some French guys are making it ad the cast is wild! Here's who's in it:

Robin Wright Penn, Ethan Hawke, Natalie Portman, Shia LaBeouf, Blake Lively, John Hurt, Cloris Leachman, Drea de Matteo, and Kevin Bacon -- talk about six degrees!

We just got so many cute pix of this couple -- CHECK 'EM OUT HERE in the GALLERY!