On the one hand, some escorting sites have been known to use fake pictures, although they usually blur the faces to make it seem more real and less obvious that they stole the pictures from somewhere else. Most escorting websites omit faces anyway so that girls won't be recognized in their own community.
On the other hand, there are some escort agencies devoted to established porn stars. They always show the faces, obviously, in addition to listing some of the girls’ credits/accomplishments. They always list prices (in the $1500/hour range).
So I don't know if this particular website is legit or not since there are no writeups on her and no prices. It seems to me that if it really was our Kimberly, she/the agency would play up her relative fame (FTV work, Hustler appearances, etc.)
But yes, if I won the Powerball I would fly her over here for a week!