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The singer only wants soft drinks and coffee available for her and the crew when she kicks off the jaunt in 2009.
"Brit loves her coffee, but since getting back into shape this is her only vice," said a tour insider.
"Only water and coffee passes through her lips and she looks great. She has been through a lot but she is back to the Britney that we all know and love."
She is reported to have signed an agreement with promoters AEG for the concerts earlier this week.
Spears's 'Circus' tour will be her first since 2004. Her sixth studio album is released in December and will be preceded by the single 'Womanizer'.
> Click here to read our review of 'Womanizer'
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