Portman: I was close to breakdown before 'Black Swan'

Natalie Portman has revealed training for her Oscar-winning role in 'Black Swan' left her on the verge of a breakdown.

The 29-year-old actress – who is expecting her first child this summer with choreographer fiance Benjamin Millepied – told The Sun that playing scientist Jane Foster in Kenneth Branagh's comic book movie Thor helped her recover from the strain of making the ballet thriller.