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The Brit fans who were lucky enough to be let in to the advance screening of Brit's MTV doc, For the Record, are revealing new details from the upcoming show.

In the film, you'll see Britney at home (eating cheese grits made by Daddy Spears on the morning of the VMAs) and at work (shooting the Womanizer video.)

She talks about how she feels isolated, like a prisoner, and how she envies Jessica Alba's ability to go out with baby Honor without being mobbed by photogs.

But Alba's not the only celeb she mentions -- Britney also talks about Katie Holmes' sense of style (and not in a good way) when she's out shopping in New York!

She also talks not only about her breakup with Kevin, but with Justin as well!!!

The doc also reveals that Brit's going to be featured in two upcoming mags, Glamour and Vanity Fair!

You just know those will be hot!