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Britney headed out to Vegas Tuesday night and she had to make four pit stops on the way -- and not for gas! I mean, not to get gas for her car ... Anyway check out this video 'cause it's classic Britney. This girl is beyond generous with us, letting us film her going to the bathroom and all the while, with a smile on her face, laughing with our photographers! Whether you're a fan or not, you've gotta admit this girl has no pretentions and must be the most 'real' star out there. Thanks Brit!

more great pix inside ...