Hard decision! Honestly, I don't like the Piaf-movie very much, but Cotillard impressed me.

1. Marion Cotillard
2. Vivien Leigh
3. Helen Hunt
4. Meryl Streep
5. Natalie Portman
6. Kathy Bates

These were awesome performances.

I also love the Natalie Portman win and the Vivien Leigh win. These are really awesome performances.

1. Natalie Portman
2. Kate Winslet
3. Marion Cotillard
4. Vivien Leigh
5. Kathy Bates

1.Marion Cotillard
2.Audrey Hepburn
3.Natalie Portman
4.Kate Winslet
5.Vivien Keigh

all of them! they were all perfect.

1. Meryl Streep (Sophie's Choice)
2. Marion Cotillard (La Vie en Rose)
3. Diane Keaton (Annie Hall)
(and these three are in my top 10 favorites too)
I've seen the others ones (except for Audrey Hepburn in "Roman Holiday"), and I've gotta say, those wouldn't have been my choices. I'm aware some of them are acclaimed (Portman, Fletcher and Bates) or not (Winslet and Hunt). In the case of Vivien Leigh (who is considered one of the most deserved), I have more trouble with the character and the movie because I hate them both. In the case of Scarlett O'Hara, she's desperately insufferable and in the case of the movie, distractingly racist.