Why do stars wear diamond rings on their left ring finger and then complain about published engagement stories?

I just saw a story about Rhianna denying engagement rumors even though she was photographed wearing a giant diamond on her left ring finger? Why do they do that? In the real world, people wear a ring on their left hand BECAUSE they want people to know they are engaged or married. Isn’t that kind [...] http://bit.ly/bG3U0y