Darren Aronofsky admitted that he tried to start a feud between Natalie Portman and Mila Kunis during Black Swan. Portman said that she was "separated" from her costar for most of production. Kunis said the two actresses quickly "figured out" the filmmaker's scheme.

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'

Speaking with Vogue in a new interview to mark the 2010 film's 15th anniversary, the actress — who was joined by costar Natalie Portman and director Darren Aronofsky — shared how she transformed herself to portray a professional ballerina on-screen.