In 'Young Adult,' the caustic black comedy from 'Juno' team Jason Reitman and screenwriter Diablo Cody, Oscar winner Charlize Theron plays Mavis Gary, a former high school mean girl who returns to her hometown with her eye on an old flame (Patrick Wilson). The problem? He's married. Not that Mavis minds, as evidenced by this exclusive new clip. Watch above.

For other new looks at 'Young Adult,' head over to Perez Hilton and Apple. 'Young Adult' arrives in theaters on Dec. 16.

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