Unique Hollywood party costume?

[uniquebabe01]

Okay, so my sister is having a huge Hollywood Themed Party. Where all her friends are dressing up as Characters from Films or Famous Actors/Actresses. Since I'm helping out, I've got to get a costume aswell. But I don't want to do the whole predictable Marylin Monroe or High School Musical thing.
I want something unique. But not like 'that extra in Forest Gump..'

Any suggestions? Past experience from Halloween's and stuff will help!

Thank youuuu.