Brooklyn Decker joins Cameron Diaz in 'What to Expect'

Brooklyn Decker has signed on to star in What to Expect When You're Expecting.

The swimsuit model will portray a young wife that experiences an easy pregnancy in spite of carrying twins, Lionsgate has announced.

Decker previously starred in the Adam Sandler comedy Just Go With It.

What to Expect When You're Expecting stars Cameron Diaz as the head of an ensemble cast also featuring Isla Fisher and Ed Helms.

American Idol judge Jennifer Lopez joined the cast in a supporting role last week.

Based on the bestselling pregnancy bible, What to Expect When You're Expecting tells the story of six different couples that are expecting a child, following them up to the delivery of their babies.

What to Expect When You're Expecting is scheduled to open on Mother's Day weekend in 2012.