I have to say that guy she's with looks a little light in his loafers... OK, OKI admit, I'm a little jealous...
Rich,
Just to make you feel a little better, I don't really think she is actually "with" him. The cover definitely looks like a Photoshop blending of two different photographs. If you look closely at the shadows cast by each of them they are not falling in a way that is conisitant with a single light source. Even if they had different studio lights on each of them, as close as they are standing there would be spillover from the different lights producing a more homogeneous shadow pattern. I am pretty sure this was two differnt shot digitally combined to make the cover.
So not to worry, I don't think she's cheating on you.