My original tumblr post was here. This image appears to have been originally posted (without any provenance) by czm35x. Some nosing around suggest that it at its source a piece of fan art called Tron Gem, created by Eric Bellefeuille. You can see more detail at his post on the work here.
The actress was Beau Garrett, who has done some nude scenes. One such was in “Turistas”.