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Catherine Zeta-Jones, Sienna Miller

Paul Drinkwater/NBC/NBCU Photo Bank, Pascal Le Segretain/Getty Images

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One black lace Emilio Pucci dress, two leading ladies. Let the BSML battle royal begin!

In one corner we have Side Effects star Catherine Zeta-Jones rocking a nude leg and black pump. Her opponent: Ms. Sienna Miller of The Girl fame with flowing blonde locks, black tights and kitten-heeled patent leather shoes.

For us, it's Mrs. Michael Douglas by a hair, literally: Her side-swept bangs are gorgeous. But which of the UK's finest do you favor?