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The A-list movie-star incursion on Broadway this fall just got a little B-listier with the addition of Haley Joel Osment to the cast of American Buffalo, David Mamet's 1976 play set for revival in November. And we can't wait: For sheer envelope-pushing, neither Daniel Radcliffe's full-frontal horseplay nor Katie Holmes's Dawson-ization of Arthur Miller is likely to compare to their fellow ex-child star's profane verbal tussles with castmates Cedric the Entertainer and John Leguizamo — a duo whose characters entangle Osment's young, broke schemer Bob in a bluer-than-blue cascade of "cunts," "fucks" and other Sixth Sense-era unutterables. And all it'll cost Osment, 20, is the low, low price of a semester behind at NYU:

He's taking a leave of absence from New York University, where he's double-majoring in fine arts and Middle Eastern studies. "I initially considered trying to do my academic classes during the day and the play at night, but it's probably not a good idea to mix those things at the same time," he told The Post. "It's my first time out, so I'm sure I'll be putting in a lot more hours in the theater than I would on a film set."

Not only that, young Osment, but you potentially just joined charter member Stephen Dorff in the Jeremy Piven Adversary Club, named in honor of the actor making his own Broadway bow this fall in the Mamet revival Speed the Plow. But no worries! Just remember the convenient Piven-bathroom-fight mnemonic, "Back of the line, I'm doing fine. Cut to the john, it's on," and you'll make influential new friends in no time.