Favorite Actresses and my Favorite Movie They Are In (not necessarily their best role though)
1. Amber Heard - Zombieland
2. Amy Adams - Talladega Nights
3. Gemma Arterton - Quantum of Solace
4. Charlize Theron - The Devil's Advocate
5. Jenna Fischer - The 40 Year Old Virgin
6. Jennifer Carpenter - The Exorcism of Emily Rose
7. Kate Beckinsale - Underworld
8. Kelli Garner - Lars and the Real Girl
9. Kristen Bell - Spartan
10. Laura Linney - Mystic River
11. Liv Tyler - The Incredible Hulk
12. Mary Elizabeth Winstead - Scott Pilgrim vs. the World
13. Mila Kunis - Forgetting Sarah Marshall
14. Naomi Watts - Stay
15. Natalie Portman - Leon: The Professional
16. Olga Kurylenko - Quantum of Solace
17. Rachel McAdams - Wedding Crashers
18. Rose Byrne - X-Men: First Class
19. Salma Hayek - Dogma
20. Scarlett Johansson - The Prestige
Based on a list by JenGirl824
I love this list.