Dressed in a sheer, delicately embellished nude gown, the actress dazzles in the new Coco Mademoiselle film.
Keira has been the face of the brand since 2007, and this is her third campaign for the French fashion house.
"The third film is very silver and quite cool," Keira said in a press release.
"But again, nobody can quite capture her; so she is kind of there, but she is sort of playing with them… And then she gets on a speed boat! What more could you ask for?"
Sporting dark, smokey eyes that add to her elusive air, Keira is seen drawing in a sexy suitor, played by Russian actor Danila Kozlovsky, to the retro soundtrack of She's Not There by The Zombies.
Keira recently revealed that the Chanel dress she wore on her wedding day is now covered in red wine stains .
"It's now got red wine spilled down the front because the last time I wore it my friend went like this" – she juts out her elbows – "and now it's everywhere," the actress told the Daily Telegraph in an interview.
"I didn't quite realise the extent of it until I got home. It's quite impressively splattered. But, hey, a good night is a good night and when a dress has had its time, maybe it's had its time.
"I'm pretty sure I can get it out but, if I can't, I'm happy with the memory of a good night and the story of how the dress got destroyed."
Chanel face and muse Keira wore the white strapless, knee-length dress to marry James Righton from the indie band The Klaxons. She teamed it with a bespoke Chanel jacket.
"Karl [Lagerfeld] very kindly designed me a jacket to go with it," she said. "I'd worn the dress lots. It was my something old. And I like not making a big deal about it. I just wanted to be in something I had had a great time in, something I would have a great time in again."
Asked if she would want to pass it down to a daughter , she said, "I don't know. I'm not sure I'm into that. Can you imagine, say, your daughter is a different shape or she doesn't like it, and all of a sudden you're giving her pressure of wearing your dress?"
Keira is one of Karl Lagerfeld's muses and recently attended the Chanel show at Paris Fashion Week.
Talking about why she loves working for Chanel, Keira said, "I get to dress up as somebody different. When I'm on the red carpet , it's, 'Oooh, who am I going to be tonight?'."
Keira and The Klaxons musician James Righton