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Rita Ora

October 31, 2012: Rita Ora at the Ed Sullivan Theater in New York City for an appearance on 'The Late Show With David Letterman'. Mandatory Credit: Kristin Callahan/ACE/INFphoto.com Ref: infusny-220 |sp|U.S., UK, AUSTRALIA, NEW ZEALAND SALES ONLY.

What Were They Thinking?!

This week's worst-dressed crew includes Sharon Stone, Kourtney Kardashian, and Christina Aguilera. -- By Matt Whitfield, Yahoo! Staff