SNEAK PEEK: Britney's New Music Video

Besieged day and night by photographers, Britney Spears goes from hunted to hunter in her music video for the single "Piece of Me." The 26-year-old pop star turns the tables on her tormenters in this clip, which was shot the week of Nov. 26.

Spears's fans still have a chance to make their own "Piece of Me" videos. Using footage supplied by MTV, amateur directors have until Friday to submit their own videos to the Britney Spears Wants a Piece of You contest.

Footage from the video is also airing Friday on ABC's 20/20