Unbeknownst to anyone, Mila Kunis was secretly blind in one eye and only had her sight restored a few months ago – which is also the same time she broke up with Macualay Culkin.
http://www.thesuperficial.com/mila-kunis-was-blind-the-whole-time-01-2011
Or maybe now that she has kissed Natalie Portman, Culkin just didn't turn her on... (Natalie Portman and Mila Kunis together... I'd pay some money to see that!) I haven't seen Black Swan yet, so I don't know how far, but I hear they just kiss while fully clothed :(
Talk about sticking it to M. Culkin!
Or maybe she had spent his last royalties from "Home Alone"?