Rachel McAdams, "Wedding Crashers" - As kentona said, she is very cute and sexy at the same time and does not need to overact it to show it, as some actresses do (Cameron Diaz). She is also a good actress.
Naomi Watts, "I Heart Huckabees" - I liked Watts in this role because it showed that she was able to act sexy but show personality as well, being disgusted with having a job as to act sexy. The role did went overboard though and she became creepy, but at least it was for comedic value.
Cate Blanchett, "Notes on a Scandal" - Yes, nothing like statutory rape to bring out the babe in someone. But she was gorgeous in this - MILF or not, and you could see why the student would be eager to lay her as quick as possible.
Emily Watson, "Punch Drunk Love" - This was a cute role. Though it could have been creepy with her stalker-ish values (stalking Adam Sandler, to boot), she brought about a sort of innocence to her character that was charming but shy.
Jodie Foster, "The Brave One" - The movie wasn't that good but always found Jodie Foster sexy, especially Jodie Foster with a gun and lots of pent-up rage.
Amy Adams, "Junebug" / "Enchanted" / "Catch Me If You Can" - I think this can speak for itself.
Laura Dern, "Blue Velvet" - A cute, innocent performance in a movie that is everything but. I don't really like Laura Dern but she was perfect to play the friendly, girl-next-door role against the much darker role Isabelle Rossellini had to play.
Marion Cotillard, "Big Fish" - Minor role but it has always stood out for me. Quiet, soft-spoken and friendly, yet concerned with her husband's plight about his father. She just seemed like that kind of trophy wife. What a babe!
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Favourite "Babe Performance" in a movie