I never tought I would be not sure about her but it this case we see only the face and a part of the body and that may be confusing. It is from a poker game called ALL STAR STRIP POKER/Girls at work.
She is IDed as Nina
That wallpaper is the one that makes me doubt, where she looks the least like her.
http://www.allstarstrippoker.com/girlsatwork/img/wallpapers/03.jpg
But on these other pics she is exactly like Lenka but unfortunately they are smaller pictures. She is the bigger picture in transparency. She is holding the cards. In that one she really looks like Lenka. You can also click on the first thumbnail of the 1st row for 4 pictures of her, and on the 1st and 2nd thumbnails of the 2nd row for 2 other pictures. And she also looks like Lenka in these 6 pictrues.
http://www.allstarstrippoker.com/girlsatwork/en_screenshots/
What do you think ?