'Thor' Prevents Natalie Portman From 'Black Swan' Breakdown

Natalie Portman is grateful she filmed "Thor" after her grueling role in "Black Swan" because the reduced workload on the comic book movie prevented her from suffering a "total breakdown". The actress embarked on a strict diet and months of intensive dance lessons to play a prima ballerina in "Black Swan", and admits she still hasn't recovered after pushing herself to the limit. Portman confesses