She sported schoolgirl pigtails for "...Baby One More Time," a super high ponytail for "Oops!...I Did it Again," and a short black wig for "Womanizer."

And in her latest music video for "I Wanna Go," the throbbing third single from her acclaimed album Femme Fatale, Britney Spears, 29, rocks multi-hued hair extensions.

"Britney was headed in the direction of 'emo girl.' All the colors came as a way to soften the bad girl image of the video but still keep it Britney," a stylist who worked on the pop star's hair tells Us Weekly.

And she didn't have to sit for hours to get this look, since her on set stylists used She by So.Cap. USA clip-on extensions rather than the bonded ones.

In the video Brit curses out a room of reporters and photographers during a press conference. (One of the questions concerns a supposed love child with Brad Pitt!)

Taking to the streets, the singer goes on a rebellious rampage -- opening up her top to a sexy policeman and getting cuffed. Next, she does battle (swinging a lethal, long-corded microphone) with photographers . . . who may or may not be human?!