For context, the 2010 movie stars Natalie Portman as Nina, a top ballerina who is preparing to play both the White Swan, Odette, and the Black Swan, Odile, in Swan Lake. As she struggles to tap into her darker side for Odile, Nina risks losing the part to another top ballet dancer named Lily, who is played by Mila Kunis.

Natalie Portman and Mila Kunis reflect on how Darren Aronofsky tried and failed to push a rivalry between the two stars on the set of 'Black Swan'

Darren Aronofsky recalled unsuccessfully trying to start a feud between Natalie Portman and Mila Kunis to ramp up the onscreen tension in 'Black Swan': 'They're both very clever and were instantly privy.