This is the biggest one I ever seen. It's from the unrated version of Sex Drive. I think the actor goes uncredited. The hot girl is Amanda Camp.
http://img111.imagevenue.com/img.php?image=81519_amanda_123_19lo.jpg
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http://img111.imagevenue.com/img.php?image=81519_amanda_123_19lo.jpg
RapidShare: Easy Filehosting