It’s already old news that Mila Kunis and Natalie Portman have a lesbian scene in the upcoming Black Swan. Apparently it was an awkward scene to film (due to its graphic nature) that director Darren Aronofsky says that the two would drink up some tequila to get themselves into the right frame of mind to do the takes. Source
Black Swan opens in theaters on December 1st. For more info , go to the official Black Swan movie site.