The words "sexy pop star" can be defined in only one word: Madonna. In the last 30+ years in her career, Madonna became the mother of sexy female pop stars, influencing the likes of Britney Spears, Christina Aguilera, Rihanna, etc. While she may have started off with corny '80s mall pop, she would progress and re-invent herself 15 to 20 times over the next few years. One thing that hasn't changed: her killer body. Sure, she might have aged a bit (She is in her mid 50's), but she remains just as sexy, influential, and powerful as she was when she began her career. It wasn't easy--she has a whole catalog of sexy videos--but we were able to narrow it down to twenty. Old and new Madge fans will have fun with this list.