Dear Maria,
Congratulations on nearing completion of your degree. There are a number of opportunities within the cosmetics industry depending upon your skills and interests. The best website I have found on the topic is this one: http://chemistscorner.com/cosmetic-science-career/
The site includes a number of articles including one on How to become a Cosmetic Chemist that I think you would find interesting. Since you are in your 4th year, I would also look around for summer internships if possible. If you research different cosmetic company websites you will find out more about their undergraduate internship programs. Good luck!