"I think that's bullsh--," Ke$ha reportedly told the U.K.'s Daily Record. "I don't think that's fair at all for people who are going to see the show. I think if you are going to be a singer, you should sing. If you are going to be a dancer, you should dance."
Ke$ha, who sang background vocals on Britney's 2008 track "Lace and Leather," said Spears should be clearer about which parts of her show are live and which are pre-recorded. "If you are going to do a combination of the two, you should make it very clear when you are singing and very clear when you are dancing," she said. "I would never do that to my fans."
But even though her comments were harsh, Ke$ha said she meant no offense to Spears. "People have asked me before to mime," she explained. "I have been up at 3 in the morning for a television show with jet lag, but I refuse to mime ... It's treating people as if they are too stupid to realize you are not actually singing.
"Sometimes it is hard to sing and dance at the same time but I would rather be off and be real and genuine about it to my fans. I don't want to treat my fans like they are stupid."
A representative for Ke$ha had not responded to MTV News' requests for comment at press time, and a spokesperson for Spears had no comment.
"That is my take on my fans and life in general," said Ke$ha. "My whole record is super-honest. I am really honest. When I am singing I may sound sh---y sometimes, but at least you'll know I'm singing."