What film do you think has brought out the best in Anne Hathaway?

I have seen a lot of Anne Hathaway's films. From Princess Diaries, to Brokeback Mountain to Rachel Getting Married and to her latest film Love and Other Drugs..I mean, she's pretty and she gives her best in all her portrayals, but I'm interested in finding out what film do you think did Anne shine the most. And why do you think so? Thanks so much for your time..I'm just so keen to know what others think about her too..