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It is Becki H / Becki Haddick.
Whilst it is a Only Tease BTS shot, she doesn't actually have her hair that dark in any of her Only Tease shoots so it must've been ahead of another shoot like Only Opaques like below. They are all under the same umbrella in any case.
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For the record, the original pic in the first post comes from the Behind The Scenes shoot dated 3rd July 2013.