Jennifer Garner is set to star in the comedy, Juno for Mandate Pictures, John Malkovich's Mr. Mudd Productions and Jason Reitman's Hard C.

Reitman is also directing the film that centers on a teenager faced with an unplanned pregnancy; Diablo Cody is writing the screenplay. Ellen Page and Michael Cena are already attached to the flick; Variety notes Garner will portray the hopeful adoptive mother.

Juno is expected to begin production in mid-February in Vancouver.