According to an interview with Look magazine, and reported by Sugarscape, when Rihanna was asked about her competition she said: "There's nobody really in my league."
She went on to say that she's "honoured to be mentioned in the same sentence" as Beyoncé, but that the pair are "different performers with different styles".
The one artist she does look to for inspiration, however, is Madonna. "She reinvented her style and music with success every single time, and at the same time remained a real force. She's fantastic," Rihanna said.