Britney Spears let loose six minutes of her upcoming documentary, "I Am Britney Jean," and the footage shows a whole lot of Britney Spears. In the clip, Spears goes through an exhausting dance rehearsal, chooses the perfect setlist for her big show and there's something about 1,300 Britney look-alikes and a helicopter in the desert. "I Am Britney Jean" premieres tomorrow (Dec. 22nd) evening on E! at 9 pm. Watch the footage below.
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