Rumour of a rift began in October when RiRi slammed the "generic pop records that Kesha or Lady Gaga" were recording. But Kesha hasn't paid any attention to the rumours, instead blaming the media for turning it into a big deal.
She tells Complex magazine, "I haven't even read that. I'm so used to the media flipping my words around that I'm sure she meant absolutely no offence to me or Katy or Gaga - Rihanna and me are totally cool, we were just on tour together, and I know that she and Katy are good friends. I don't take any offence because I'm sure it's bulls**t anyway."
Check out a sample of Kesha's "generic pop" below.