August 27, 2009 at 09:35 AM EDT

Christina Hendricks, best known as Joan Holloway on AMC’s Mad Men, has joined Katherine Heigl and Josh Duhamel in the romance Life as We Know It, according to Variety. The movie centers on two singles, played by Heigl and Duhamel, who become the guardians of their best friends’ orphaned daughter after a fatal accident. Hendricks will play Heigl and Duhamel’s best friend.

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