Cameron Diaz to star in "Expecting"

Cameron Diaz is in final negotiations to star in "What to Expect When You're Expecting," a romantic comedy based on the bestselling pregnancy guidebook.

The story follows five couples who suffer the many joys of the childbirth process. Diaz will play a 42-year-old woman in the mold of Jillian Michaels and hosts a weight-loss fitness show. Kirk Jones (Nanny McPhee) is directing the Lionsgate/Phoenix Pictures project.

Diaz, 38, was last seen in "The Green Hornet" and is generating quite a bit of advance buzz for her potty-filled turn opposite ex-boyfriend Justin Timberlake in the title role of "Bad Teacher," which opens June 24.

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