From donning a prosthetic penis to simulating bizarre sex work in a steamy motel room, Sydney Sweeney was "up for anything" while filming her Oscar-tipped role in boxing drama "Christy," her director has told AFP.

Sweeney, who has made negative headlines recently for controversial jeans ads, has become a contender for the Academy Awards for her portrayal of pioneering female fighter Christy Martin.

The movie had its world premiere this weekend at the Toronto International Film Festival, where Sweeney's performance and physical transformation drew glowing reviews.

Though ostensibly a boxing biopic, "Christy" swiftly develops into a surprisingly dark tale of domestic abuse and misogynistic control, as Sweeney's pugilist falls under the jealous and violent sway of her coach and husband Jim

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