Cameron Diaz Sports A Baby Bump... For New Movie

Cameron Diaz has a faux bun in the oven!

The actress was spotted on the set of the upcoming film adaptation of top-selling pregnancy guide from authors Heidi Murkoff and Sharon Mazel, “What To Expect When You’re Expecting,” on Monday giving fans a glimpse at what she might look like pregnant.

The 38-year-old actress plays a TV fitness guru in the ensemble project.

In addition to the blonde big screen beauty, the cast includes Jennifer Lopez, Elizabeth Banks, Anna Kendrick, Brooklyn Decker, Dennis Quaid, “True Blood’s” Joe Manganiello, and Chris Rock.

“What To Expect When You’re Expecting,” is expected to hit theaters on Mother’s Day Weekend 2012

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