Andie MacDowell has also come aboard the Fox/New Regency project, which is based on a Jules Bass young-adult book titled "Headhunters." Gomez plays a girl who is mistaken for.

A socialite, resulting in her flying to Monte Carlo for a charity auction along with her best friend and her soon-to-be stepsister.

The story kicks into adventure mode when a million-dollar necklace goes missing and the girls must scramble to find it.

Cassidy plays one of Gomez's friends (Meester plays the other), a high school dropout who wants to see what the world has to offer.

Monteith plays her football player boyfriend, who pursues her to Europe. MacDowell plays Gomez's mother. Shooting takes place this spring in Budapest, Paris and Nice. Tom Bezucha directs.

The movie could fall into the same wheelhouse as "Diary of a Wimpy Kid," Fox's recent hit adaptation of the popular Jeff Kinney books that also hit the teen and tween demo.

Monteith will shoot the film on his hiatus from the hit musical-themed TV show, "Glee," in which he plays jock Finn Hudson. Cassidy, who also has appeared on TV's "Supernatural" and "Harper's Island," will be seen on the big screen in the reboot of "A Nightmare on Elm Street."