"She was also able to see video of herself playing throughout the auditorium," a backstage source tells Us Weekly.
"She flipped out. She came running off the stage, yelling â€˜Oh, my God, I looked like a fat pig! I looked like a fat pig!' She was inconsolable."
We wouldn't that far, but clearly, Spears has no one to blame but herself for her incredibly hyped and disastrous performance at the VMAs.
The lip-synching pop tart showed up late for her big comeback, reports the New York Post - completely unprepared and with a drink in her hand.
On Saturday, the day before the VMAs, Britney Spears was scheduled to arrive at rehearsal at around 1 p.m. You know where this is going.
"She didn't even get to Las Vegas until 4:30 p.m. It was ridiculous," an inside source tells the Post. "The production people at MTV were freaking out. Nobody can tell Britney what to do anymore. No one can control her. She is a mess."
To make matters worse, when she arrived in Vegas, Britney Spears didn't go straight to rehearsals, but instead to the mini-bar.
"She went to her hotel and ordered a bunch of food and some margaritas," the spy said. "She came down an hour later with a frozen margarita in her hand."
When Spears preformed, she stumbled a couple times and couldn't remember the words she was lip-syncing. She covered her mouth at one point but by the end of the song simply gave up any pretense of singing.
"The dance number was spectacular ... without Britney," said a Post source who witnessed the rehearsal. "When a stand-in was rehearsing with the dancers, in the hours they were all waiting for her, it was amazing. Then Britney showed up and refused to do anything."
Reportedly, the dancers were supposed to lift and twirl Spears in the air a few times, and that just wasn't going to happen in her condition. All of the more complicated dance moves had to be erased because she couldn't cut it.
Meanwhile, Britney Spears grew increasingly agitated because she didn't like the outfit MTV had selected for her. Says a source:
"MTV wanted her to wear a corset. It would have looked great and covered a lot of things up, but she hated it and didn't think it was sexy enough."
Instead, Spears changed into a bra-and-underwear outfit she'd brought with her - one that emphasized her weight gain over the last year.
Yes, Chris Crocker. We know she "had two f*%king kids." We're just sayin' there's a little more junk up in that trunk nowadays.
MTV execs weren't the only ones worried about the impending debacle. Another spy said worried dancers were texting pals, asking them to pray for them.
After the debacle, she allegedly broke down in tears but then partied until 3 a.m. and once again was photographed by paparazzi wearing no underwear.
You know, standard operating procedure.