'Mum-to-be' Cameron Diaz is fighting fit
But the single star hasn't slipped up she's wearing a prosthetic tum for her role in What To Expect When You're Expecting.
In the film she plays an expectant mum determined to keep up a punishing fitness regime throughout her pregnancy.
The trailer for the movie, based on the bestselling manuals by Heidi Murkoff, hit the web today.
It boasts a star-studded cast, including Jennifer Lopez, Brooklyn Decker, Anna Kendrick, Elizabeth Banks, Chase Crawford and Dennis Quaid.
And Glee star Matthew Morrison plays Cameron's husband.
The film, which follows seven couples through the ups and downs as they prepare to become parents, is a fictional take on the Murkoff books, which have sold over 40 million copies worldwide.
Yummy mummy ... Cameron gets a craving in the movie
Splash NewsIt also includes Cheryl Cole's movie debut, as the judge on an X Factor-style talent competition in which Cameron's character is a contestant.
The 39-year-old actress, who has previously dated Matt Damon, Jared Leto and Justin Timberlake, split from latest boyfriend Alex Rodriguez in September 2011 after a year.
Video: New pregnancy comedy trailer
TRAILER for star-studded comedy with Cameron Diaz and Jennifer Lopez
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