A trailer for Britney Spears' documentary is now online

Britney Spears has popped a trailer thing for her forth­com­ing doc­u­ment­ary onto the world wide web.

As you well know the incred­ibly personal I Am Britney Spears 'airs' in America on December 22 and in the UK on Boxing Day.

The teaser shows the 'Ooh La La' hitmaker rehears­ing for her Vegas shows and generally being thrown around by her dancers.

The whole thing carries the air that the whole show might not be ready in time, with Britney saying at one point: "I'm really nervous — what if I just blank out and just stand there".

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