Israeli-American actress Natalie Portman shocked the 67th Venice International Film Festival (Sept 1-11) attendees with a steamy lesbian scene with Mila Kunis in 'Black Swan' that opened the gala.

In the scene, Portman and Kunis hit the sheets together, reports hearldsun.co.au.

Darren Aronofsky directed the film, which portrays Portman as a ruthless ballerina desperate to land the lead in a ballet. The film includes scenes of drug-taking and self-harming.

'Black Swan' also stars Portman's real-life beau Benjamin Millepied as the leading man.