Spears drops excerpt from her new documentary "I Am Britney Jean"

The singer Britney Spears released an excerpt from her new documentary.

Titled I Am Britney Jean, the film shows the personal and professional life of the star, the process of preparation and rehearsals for the show in Las Vegas, "Piece of Me".

The documentary is produced by World of Wonder and directed by filmmakers Fenton Bailey and Randy Barbato. It will air on December 22 on the U.S. E! Channel.

Watch the excerpt from I Am Britney Jean below: