Jessica Biel cast on Fox's 'New Girl'

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Actress Jessica Biel attends the Tiffany Debut of the 2014 Blue Book on April 10, 2014 at the Guggenheim Museum in New York, United States.

Jessica Biel is coming to Fox's "New Girl" as "the hottest scientist in the world," TheWrap has learned.

The stint is just for one episode, the Season 4 premiere.

Here's Fox's full description of this fall's first half-hour: "It's the last wedding of the season, and the gang challenges each other to see if each of them can get lucky at the big event. Jess (Zooey Deschanel) sets her sights on a cute guy at the wedding - only to be taken on by Kat (Biel), the hottest scientist in the world."

"New Girl" returns to the airwaves on Tuesday, Sept. 16, sandwiched in between a new "Utopia" and the season premiere of "The Mindy Project."

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