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Bitch Stole My Look: Kate Middleton vs. Leighton Meester

Duchess Catherine, Kate Middleton, Leighton Meester, Gossip Girl Rex USA; Giovanni Rufino/The CW

How's this for a showdown: a real-life royal versus Gossip Girl's Queen B.?!

Kate Middleton stepped out in a stunning, rose sequined Jenny Packham dress, J.K. Bennett clutch and peep-toe heels Thursday night for the Ark charity gala at Kensington Palace.

But her floor-length frock might have had some CW fans doing a double-take. Leighton Meester's alter ego, Blair Waldorf, wore the same dress when she became engaged to Prince Louis this past season in the episode titled "The Princesses and the Frog."

So who reigns supreme in this sparkly dress? Vote below! 

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