The American Idol runner-up and Demi Moore and Bruce Willis' daughter-about-town have signed on to star in the latest from Adam Sandler's Happy Madison productions.

In the as-yet-untitled comedy, McPhee and Willis will have to muster all their acting skills in order to play "sisters" in the "lamest sorority on campus," according to The Hollywood Reporter. Their distinctively "lame" characteristics? McPhee will be a pregnant hippy and Willis a woman unwilling to remove an unnecessary backbrace.

McPhee playing pregnant? Sounds like she's practicing for the fifteen babies she's said she wants!

In addition to the Happy Madison project, both McPhee and Willis have other acting gigs lined up. The Reporter notes that McPhee has committed to indie dark-romantic-comedy The Last Caller, and Willis will join Mischa Barton and her Die Hard dad Bruce in dark comedy The Sophomore.

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