Vamp Kristen takes the plunge

The Twilight beauty risked a nip slip with a plunging neckline that showed a lot of side-boob at the premiere of Robert Pattinson's movie Cosmopolis.

Following the Brit actor's support at the red carpet bash for her movie On The Road, earlier this week, girlfriend Kristen returned the favour at his Cannes screening.

But the 22-year-old stole the show in her daring scarlet gown and dramatic swept back hairstyle - before changing into hotpants and a red leather jacket to celebrate at the nearby Carlton Beach Club.

Robert, dressed in a tuxedo for the event, plays a superrich financier who battles across busy New York to get a haircut in the David Cronenberg movie.

Booby trap ... Kristen shows a little too much

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But it was Kristen's pal Tom Sturridge who looked in need of a good hairdresser last night – he fell short in the style stakes with a dodgy, pinned-up style.

Dramatic ... Kristen

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Kristen and Robert, who have kept their long-term romance as private as possible, kept apart on the red carpet as she posed with actor Tom.

Hug ... Kristen with Tom Sturridge

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Tom gave her a cuddle on the red carpet, as she put her head on his shoulder.

Pals ... Tom and Kristen

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And Kristen draped her arm around his shoulders as he squeezed her waist in another shot.

Premiere ... Kristen's boyfriend Robert Pattinson at the premiere of his movie

The friendly hugs failed to crack the ice maiden's sulky look though.

Maybe she was worried about what her boyfriend was thinking.

Ice maiden ... Kristen fails to crack a smile

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