A fierce, twisted rivalry between ultracompetitive prima ballerinas for the starring role in "Swan Lake" — what could possibly go wrong? Nina (Natalie Portman) is everything you'd think a ballerina would be: poised, proper, and perfect. In fact, she is perfect for the role of the White Swan in the performance. But newcomer Lily (Mila Kunis) becomes not only a rival — and the perfect Black Swan — but also an odd sort of friend and maybe sometimes more. If you're not still thinking about that sex scene between Portman and Kunis after watching this once, we think you need to watch again.