Britney Spears Preps for Vegas Residency in ‘I Am Britney Jean’ Documentary Trailer [VIDEO]

Britney Spears has said that 'Chaotic,' the reality trainwreck, er, show in which she starred with her ex-husband and baby daddy Kevin Federline, was the biggest mistake of her career. But Brit Brit has not soured on the documentary format or on letting the cameras into her life.

She is the subject of 'I Am Britney Jean,' a two-hour event which will air on Dec. 22 on E! at 9PM ET. It's being billed as a movie, too. It's a big deal in Brit's world.

We see Brit dancing her face off and getting her you know what together as she prepares for her Las Vegas residency.

There's a cute and adorable Brit Brit moment in which she suggests that she might freak out and freeze and just stand there wen she is supposed to do something else.

Brit is so cute, especially when she shows off her human side.

We can't wait to watch the doc next Sunday!