It is model Carly Foulkes, previously seen in the Rugby print campaign.
Her dress was designed specifically for the commercial by Debra LeClair, the set/costume designer for the ad production company, and is not commercially available.
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Her name is Carly Foulkes and her dress is by Debra LeClair.
http://latimesblogs.latimes.com/…
Her first name is Carly, but we are not sure of her last name yet.
http://androidandme.com/2010/11/…