if you witnessed the atrocious performance put on by Britney Spears to open this years VMAs, please buy yourself some new trousers. Supposedly Brit heard the jokes Sarah Silverman was going to make about her “mistakes” (children), and consequently threatened to walk out moments before starting. MTV also heard she was going to be a super slut with Criss Angel, so at the last minute everything was changed and Britney proceeded to give her shittiest performance ever.

From BH:

Supposedly, what Britney and Chris were planning was to do a set of mirrors and flotation. But when told to the Palms Hotel / Casino… the hotel flipped. Insurance was the main problem, and the stage couldn’t support the performance. MTV also freaked at the last minute because of their fear of being “too controversial” during the performance. Britney and Chris were infact furious with MTV’s sad excuse and told Britney to change the performance at the last minute.

X17 adds this:

A source tells X17 Brit found out about Sarah Silverman’s crappy line about Britney’s babies just moments before she took the stage to perform “Gimme More.” Needless to say, Britney was PISSED! … as any mom would be. Britney was so upset she walked through her performance just to get it over with (despite encouragement from her friends, including Sam who was apparently yelling at Sarah backstage) to skip out on it all together). She held up her end of the bargain and got a major slap in the face from Sarah.