I really don't know what proxy use to get it :|
This dress you could get with new Stardoll Monte Carlo account..
For USA
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If you're from USA.. Visit this page:
http://www.stardoll.com/es/montecarlo/party.php . You see three dolls, choose first - Grace. Third girl gives HB Dress but I haven't photo of it. Stardoll generates your nickname but you may create own. Complete all the boxes and click "Enter The Ball".
pics>SMW