Rihanna is a Barbadian singer and songwriter who moved to the United States at age 16 to pursue a music career. She signed with Def Jam Recordings after singing for Jay-Z. In 2009, her performance at the Grammys was canceled due to an altercation with then-boyfriend Chris Brown, who pleaded guilty to assaulting her. Rihanna has released several successful albums between 2005-2010, including singles that reached number one on the Billboard charts. She has won several awards for her music and serves as an honorary ambassador for Barbados.