It sure looks like her? I am sure her reps would deny if it was.
Maybe it's sort of like how WWE Star Mickey James' X rated pics were just passed off as Tabatha Stern. Any one who does basic "research" can easily see the difference.
Anyways for anyone who has earned enough rep points to see them you can find the explicit pictures here:
http://www.newsgab.com/forum/celebrity-pictures-explicit/53741-kristen-davis-sex-blow-job-close-up-muff-pics.html