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Style is a tough business in Hollywood.
So, in a fashion-off between Kim Kardashian and Ashlee Simpson-Wentz, who do you think takes tops trumps?
And they're not the only stars making us do a double take by wearing the same dress.
Madonna, Whitney Houston, Pink and Shakira are all competing for the who-wore-it-best crown.
Go and take a look.
Find all the latest about your favourite star
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