Natalie Portman won an Academy Award for Best Actress for her role as a dedicated ballerina who descends into madness while preparing for the lead in "Swan Lake" in what 2010 psychological thriller?

The 2010 psychological thriller in which Natalie Portman won an Academy Award for Best Actress for her portrayal of a ballerina consumed by her role in "Swan Lake" is "Black Swan (Review)." Directed by Darren Aronofsky, the film delves into the intense and often brutal world of professional ballet, exploring themes of obsession, perfection, and the fragile line between reality and hallucination.

Portman's performance as Nina Sayers, a dancer striving for the dual roles of the innocent White Swan and the sensual Black Swan, earned widespread critical acclaim. To prepare for the demanding role, Portman underwent rigorous ballet training for months, dedicating five to eight hours daily for six months and losing a significant amount of weight. This intense preparation allowed her to authentically embody the physical and psychological toll Nina experiences as she grapples with the pressures of the production and her own mental unraveling.

"Black Swan" was a critical and commercial success, grossing over $329 million worldwide against a $13 million budget. The film received five Academy Award nominations, including Best Picture and Best Director, with Portman ultimately taking home the Oscar for Best Actress at the 83rd Academy Awards in 2011. Her powerful and transformative portrayal of Nina Sayers is often cited as one of the most memorable performances in modern cinema, showcasing the extreme dedication and sacrifice required in the pursuit of artistic perfection.