Rihanna can be considered as one of the best and well-dressed celebrities in Hollywood. Rihanna's costumes are now a signature collection of many important celebrations. Rihanna has it all when it comes to costumes even in choices of dresses during Holloween. Whether it is a gown or any other variety, Rihanna costume can be the best choice. Her style is one of the most popular costumes of 2016. Here are the best 10 costumes she sported this year.