Okay, there's a better nude shot of her on one of her photographer's OMP profile! If you follow the "Photographer Link" from the shot listed above, you get this profile:
Under the category "Fine Art Nude", the fifth photo shows a nude woman with another woman's face (Holly/Melissa's) looking over her shoulder. The sixth picture has no faces, but you can tell that it is the same shoot, with the same other model standing behind Holly/Melissa. It's a clear topless shot, and the breast and nipple look the same as the side view topless shot she has on her own profile.
Here's a direct link to the fifth and sixth shots:
Shot #5 is linked to Holly's OMP profile crediting her in the image, but #6 is not, even though is it is clearly the same two models. I assume so that this is so she can disclam that particular topless shot, but comparing it to the topless sideview she did cop to--it's definitely hers.
The links don't work, someone repost something that works?