Credit: Dave Hogan/Getty Images

She's on a red carpet roll!

After donning a stunning sparkly purple J. Mendel gown with a racy thigh-high slit at the Los Angeles premiere of Breaking Dawn - Part 1 on Monday, Kristen Stewart stepped out in yet another stunning look for the film's UK debut on Wednesday.

Clad in a black embellished Roberto Cavalli number, accented by a leather Alexander McQueen belt, the 21-year-old (who pulled her dark waves back into a pretty ponytail) was all smiles as she posed for pics alongside her on-and-offscreen love Robert Pattinson.

Tell Us: Is this Kristen's best look yet?