Costume-Costumes.com

For my sweet 16 party, I am a girl, The theme is Hollywood and you come dressed as someone from a movie, like the character, NOT a celebrity. So you would come as Juno for example, not Ellen Page (the actor)
So I need ideas for a character to go as. EG: juno, cinderella, james bond, etc

But I dont want them to be slutty, but not totally dorky ,a little sexy, so I want a really cool outfit and I really want to shine at the party since its my 16th!
Also any party ideas are welcome too including decorations or games, etc.

THANKS!!!!!