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i'm guessing she's wear lanvin? chiara my gosh is the splitting image of her father Marcello Mastroianni 

Ah, it is Lanvin indeed, Spring/Summer 2011 collection.
She surprised me a bit with choosing this dress, but in the best way possible. So simple yet elegant, really beautiful. The bag she's wearing in #867 is Lanvin too, I recognize the logo
style.com

I love looking pictures of Catherine, she's so elegant.