The Hot Right Now singer is constantly likened to the Barbadian star, with people finding similarities in their looks and music.
But Rita told The Sun that she and the Diamonds singer aren't all that alike.
Asked if she was fed up of being referred to as the new Rihanna, Rita said: "A bit. She's incredible... but we're just so different.
"First off, I'm just a little girl from the 'hood in east London, and she's an island child.
"Also, her bum is much better than mine."