A couple weeks ago, we were criticized for writing that Adam Lambert blastedSusan Boyle's album and rendition of "Wild Horses." Fans of the American Idolfinalist thought that was a misrepresentation of his comments.

But make no mistake now: Ke$ha has very much torn into Britney Spears.

In a new interview, the outspoken singer was asked about Britney's habit of lip-synching during concerts and replied:

“I think that’s bull$hit. I don’t think that’s fair at all for people who are going to see the show. If you are going to be a singer, you should sing. If you are going to be a dancer, you should dance."

“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. I would never do that to my fans... It’s treating people as if they are too stupid to realize you are not actually singing... I would rather be off and be real and genuine about it to my fans."

This isn't the first time Spears has been called out for pretending to sing live. A few months ago, fans in Australia walked out of Britney's Circus tour due to the singer's shoddy lip-synching and general performance.