Is Britney Starving Herself To Look Skinny On The X Factor?

Britney Spears has already lost a considerable amount of weight over the past few months, but The Daily Mail reports that the pop princess is determined to slim down even more before she performs on The X Factor on Saturday. Sources tell The Daily Mail that Britney is going to "extreme measures" to look skinny, and she's reportedly going to bed hungry and "dieting so hard she's suffering from insomnia, anxiety, flushes and shakes." That doesn't sound like fun! Other online reports claim Britney is trying to lose seven pounds in the next few days, and dad Jamie and those close to her "are trying to get her to eat more, but Britney is determined not to be criticized for having any extra bulk." Guess she doesn't want to have a repeat of her disastrous 2007 VMAs performance, but given how great she's been looking lately, we don't see how that could possibly happen! Could Britney stand to lose a few lbs? Or is she ok the way she is?