How do I deal with this y blonde?

I'm 58, and look really good for my age, and recently started hooking up with some of my clmates. One of them is a woman who was always the popular cute one in school and could have any guy she wanted. Since that time she has aged well, as I have, but she now has huge implants, and has bleached her hair, we both wear our hair past our shoulders, we are just young looking 58 year old women. But the point is this. She never wears anything except extremely revealing clothes, her are always hanging clear out. The men love it of course, but it makes me uncomfortable and another friend of ours told me she doesn't like it either and is very uncomfortable. She is married, and her husband is never with her. So one of the other guys who is married also, sometimes his wife is not there either. He can barely take his eyes off of her and when he talks, even if he is talking to the group, his eyes are transfixed on her. I can't decide if I'm being jealous or if this is just improper of her to dress so revealing. All of her clothes are extremely low cut, I'm not talking just a little , but as if you are sitting there with a playboy bunny with barely nothing on covering her chest. I am trying to like this person, we were never friends in high school, we never connected then. But now she is suddenly wanting to be my friend. My boyfriend will be joining me this weekend with that group and I do not like knowing that I will be sitting there with him not able to keep from looking. Who could? I'm sure she will hug him and all, because even he kind of knew her back in school. Any suggestions? Should I just not let this bother me? Or would it bother any of you?