Rihanna is a Barbadian singer, songwriter and actress. She signed with Def Jam Records in 2005 and released her debut single "Pon de Replay" which was a commercial success. Since then, she has released 8 studio albums and sold over 250 million records worldwide, making her one of the best-selling music artists of all time. Rihanna's musical style and public image have evolved over her career, from innocent dance-pop in her early work to more explicit lyrics and an edgier persona in later albums like Good Girl Gone Bad and Rated R. She has won 9 Grammys and is known for hit songs like "Umbrella", "Diamonds", and "We Found Love".