Kristen's bold fashion choice comes just two days after she wore a sheer skirt by designer Zuhair Murad for the Los Angeles premiere of Breaking Dawn.
Kristen appeared relaxed on the red carpet for the film's London premiere, but unlike their US appearance, herself and on-off beau Robert Pattinson didn't pose together.
However, they were snapped afterwards with a dressed-down Kristen wearing an outfit we're more used to seeing her in -- jeans and a parka-type jacket saying God Loves Ugly.
Twilight stars Kristen and Robert (26) are rumoured to be back together, several months after it emerged that Kristen was having an affair with married Snow White And The Huntsman director, Rupert Sanders.
And while she isn't saying bye to Rob, she is now saying goodbye to her role as Twilight's Bella.
Maybe last night's outfit was a statement of intent.
Another woman who got people talking was a radiant Peaches Geldof.
A beaming Peaches (23) attended the London premiere with her partner Tom Cohen, looking blissfully happy wearing a red dress which hugged her curves and showed off her growing bump.
Earlier this week, she revealed she was expecting her second child, a sibling for her and Tom's seven- month-old son Astala.