A rep from Sony reveals exclusively to BreatheHeavy.com that Britney rehearsed ‘Do Somethin’ “all day” at Stage 27 at the SONY lot, on Washington Blvd, in Culver City Thursday afternoon. Security was “extreme.”

“They are practicing on the actual tour stage, the stage is too huge to fit in a dance studio,” said the source.

Whatcha gonna do when the crowd goes Ayo?

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