How do I tell my sister...?

I have a sister named Laurie who is a wicked tramp. She use to sleep around alot with different guys she just met, like a guy she met at a bar who was a tatoo artist, three guys from the internet, one was married! She travled out of state to spend the night in a hotel with the married one. She dated two guys at once and got pregnant and had to have an abortion. Now she is married, about a year, and thinks she is great. She never talks about all her indescrestions and she is trying to get pregnant again but can't. I get so mad because she thinks she is an angel now, I want to tell her and her husband what a tramp I think she is. What really makes me mad is that she is always putting people down for everything they do, sometimes I just want to pucnh her in the face and tell her shut up you stupid hoe! Being around her makes me so mad and brings out the worst in me. What should I do she is suppose to be my big sister but I hate her,does anyone eles know what I am going through,PLEASE HELP