BEVERLY HILLS, CA - DECEMBER 11: Recording artist Rihanna (hair detail) attends Rihanna's First Annual Diamond Ball at The Vineyard on December 11, 2014 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
BEVERLY HILLS, CA - DECEMBER 11: Recording artist Rihanna (hair detail) attends Rihanna's First Annual Diamond Ball at The Vineyard on December 11, 2014 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)