who's this beautiful big-butted/big-thighs lady?

I really need your help with this lady and it won't be easy. I've tried everything, from reverse search (in google, tineye, yandex...), to trying to find the original tumblr gif. there's nothing on the net, just useless russian websites.
I hope somebody will recognize her, since I find her body marvellous... but without the face is not easy at all. eternal gratitude to anyone who recognizes her!