Costume ideas for Hollywood mixer?

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Who would you dress up as? I need some help thinking of the perfect outfit! I know a couple girls are going as Josie & the Pussycats... and I'm sure Charlie's Angels will be there...

I have a Marilyn (Seven Year Itch) costume that I love. However, I'm sure there will be other Marilyns, and I want to be more original (ironically, considering I'm asking a message board what to wear). Can anyone give me a costume suggestion?

Also! Post fun Hollywood costume ideas in general, so people can use this post as a reference!

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How silly of me!

I think I will go as Princess Fiona, because my boyfriend's fraternity is hosting it, and his fraternity name is Shrek. (Sadly, he'll be out of town, so he can't dress up with me, hehe.)