Britney's excuse for being frazzled during her performance is complete bullshit, we all know this, but now there's proof. Brit-tit's camp claimed she was a mess because she had heard Sarah Silverman rehearse her jokes where she made fun of her kids. Well Sarah's camp and MTV respond:

"Sarah did nothing but react to Britney’s actions in a comical way, which is what she was asked to do,” said Silverman’s rep, Lewis Kay.

A show insider also said:

“There was no MTV script approval,” says a show insider. “The only person who knew what Sarah was going to say was Sarah. When she rehearse she even said, ‘Joke. Joke. Joke. 50 Cent. Britney Spears. Etc.’ And she only mentioned the names of the people that she was going to talk about. No one ever heard her material before it aired.”

Haha! Bitch is shit out of luck and all out of excuses.