Kristen Stewart: Born To Be Bad!

Twilight twosome Kristen Stewart and Robert Pattinson put on their best head-to-toe black ensembles for the premiere of their haunting film at Vue West End in London on Tuesday evening.

Kristen,18, who sparkled in Chanel jewels (a Black Onyx Camelia ring and Matelasse cuff), has just signed on to play rocker Joan Jett in the upcoming The Runaways, about the punk practitioner’s 1970s all-girl rock band responsible for “Cherry Bomb,” “Queens of Noise” and “Born to Be Bad.”

She’ll tackle that role after she and Rob, 22, film New Moon (March 2009), the first of three sequels to Twilight.

25+ pics inside of Kristen Stewart and Robert Pattinson looking bold in black…