Roc Nation's roster just got considerably stronger as Rihanna has decided to call the label her recording home. She leaves Def Jam after a seven album run that began in 2005 when then-President Jay Z signed her to the label. The singer was already being managed byRoc Nation. This move simply keeps everything in house for the Barbadian beauty. Riri joinsJ. Cole, Willow Smith, Rita Ora, DJ Mustard, Calvin Harris, Alexa Goddard, Mayaeni, Jay Electronicaand of course, Hov himself as an artist under the Roc Nation umbrella. The addition gives Jay's label one of the biggest superstars on the planet. Rihanna has sold over30 million albumsand120 million singlesworldwide during her career. At only 26-years old the singer is in the prime of her career.