I recently saw the 2012 film
The Thompsons in order to document the scenes (mentioned at the time on websites, blogs and forums that cover such things), involving the actresses Katarina Gellin and Zoe Grisedale.
Unexpectedly, I found the film also contained a hitherto unmentioned topless scene featuring British actress
Elizabeth Henstridge who has since secured a high profile role playing Jemma Simmons in
Marvel's Agents of S.H.I.E.L.D.
Undoubtedly her scene was disregarded at the time by those early birds as unworthy of mention due to a combination of her not being seen fully topless (i.e. with her nipples not visible), and her not then being particularly well known for anything that would have merited especial attention. And because of this pretermission it wasn't generally picked up on when she got the part in Agents of S.H.I.E.L.D. the following year.
The Thompsons is a USA/UK production filmed mostly in the UK about a young man called Francis from an American vampire family called the Thompsons who are wanted by US authorities and so he and his kin flee to England to seek the help of a British vampire family called the Stuarts. Elizabeth Henstridge plays Riley the daughter of the Stuart family and is the only one of them who has no vampire powers.
In this scene Riley comes to Francis' guest room at night to seduce him only to unexpectedly become vampiric and bite into his neck - although it turns out he is having a nightmare.
It must be pointed out that her face is not seen in the same shot as her right breast and so there is the possibility that it was done this way because a body double was used.
The screenshot images do reveal that there are a number of moles on her back and this image of Elizabeth Henstridge wearing a backless dress in a red carpet pose shows she does have a profusion of moles on her back. Whether they are in the same position or the same quantity is difficult to assess with the resolution of screenshots available.