Britney Spears

Nope. It's just in the mind of the public, there is just one Britney, therefore it is unecessary to use her surname. Like when you're with your group of friends and each person's name is unique, there is no reason to tack on their last name when you refer to them. So, just for ease and because she is so damn famous, she is called "Britney". To me, just calling her "Britney" without the "Spears" part of it is also endearing in a way, kind of like talking about/to people you know, you don't use their last name. Regardless, she is amazing beyond words and I love her to frikken death.

-L