By Sarah Bull and Nadia Mendoza

Her dewy, peaches and cream complexion has made her the envy of women everywhere, not to mention landed her lucrative contracts with cosmetic brands like Chanel.

But it seems the harsh winter weather has gotten the best of Keira Knightley, as like so many of us, the actress has succumbed to the desire for golden summer skin.

Keira, 26, sported some very questionable fake tan at the premiere of A Dangerous Method in London last night.

Scroll down for video of Keira at the premiere

Fake tan faux pas: Keira Knightley sported a patchy job on her fake tan at the premiere of A Dangerous Method in London

Patches of fake tan were visible on the star's back - notoriously hard to reach when self-applying a faux summer glow.

The splotchy skin was made all the more obvious by Keira's burgundy gown, whose backless panel only served to attract attention to her slip-up.

Miss Knightley looked otherwise flawless in her floor-length Burberry dress, Louboutin heels and Chanel accessories.

She sported smokey make-up and wore her hair swept-up - but Keira certainly let it down at the after-party as she grooved on the dance floor with co-star Michael Fassbender.

Even once the cameras had stopped rolling on set, the two co-stars couldn't resist putting on a show for onlookers at the party held by GQ at 34 Restaurant in Mayfair, London.

Inglourious Basterds star Fassbender, 34, draped Keira over his arm and bent her backwards as they dominated the space between the tables and turned the dining area into their dancefloor.

But it was boyfriend James Righton of The Klaxons who got to take Keira home at the end of the night.

Fake tan faux pas: Keira Knightley sported a patchy job on her fake tan at the premiere of A Dangerous Method in London

Not an inch to pinch! Keira Knightley wore a backless maroon dress as she attended the premiere of her new movie A Dangerous Method in London this evening

Despite devoting her attention to Michael, it was clear Keira only had eyes for James as they kissed and giggled together in the back of the waiting car after leaving the party.

Having only dated for a year, the couple are still in the honeymoon phase of their romance.

Keira formerly dated her Pride & Prejudice co-star Rupert Friend from 2005 until December 2010.

The British actress stars as Sabina Spielrein in David Cronenberg's new film, a psychiatric patient who embarks on a love affair with her doctor, Carl Jung.

His leading lady: Klaxons star looked a little out of his depth as girlfriend Keira soaked up the attention

Relieved: James looks happy to finally be inside the car away from the media spotlight

The look of love: Keira cups James Righton's head in her hands as they left the afterparty

At the premiere Keira revealed that the risqué scenes almost had her turning down the project.

'I did think about turning it down because of the two scenes of a sadomasochistic nature and I thought it's all going to come out and all of a sudden it's all going to all be about that,' she said.

'And weirdly, apart from this country, it hasn't been, so that's been really great. In England it's got mentioned all the time. I don't know what that says about us. We obviously like spanking, I don't know.'

Flirtatious: Michael Fassbender dances with Keira Knightley at the afterparty of A Dangerous Method film premiere, hosted by GQ at 34 Restaurant

Attention addicts: Even when they're not on set, the actors can't resist playing up to onlookers

And talking recently about what first encouraged her to take part in the risqué movie, Keira said she found the tale an inspiring one.

She said: 'The idea that you've got somebody that is so sick at the beginning - completely trapped within herself, she'd been chucked out of tons of asylums beforehand, people had completely given up hope with her and she'd given up hope in herself. She literally thought she was possessed, she was demonic. ...

'And through analysis, she can be pulled out of herself, and not only that, but her intellect can be stimulated, she can be functional within society and become a psychoanalyst in her own right and come up with ideas that inspire both Freud and Jung.'

And the boys were at it to... Michael grabbed Viggo Mortensen for a serenade too

A Dangerous Method also stars Michael Fassbender as Jung and Viggo Mortensen as Freud.

And Fassbender said recently that one of the main reasons he signed on to the project was so he could work with director Cronenberg.

Recalling his attitude on set, Fassbender said: 'He’s very sweet and loving, very generous and very humorous.

'We joked around a lot on set, which is always fun and can also lend to the piece, especially when you’re dealing with something that is very much set in a particular time.

'It’s a period piece, so there are the social etiquettes, in the way people held themselves and related to one another.

Retro: Keira teamed the dress with smoky eyes and pale pink lips, with her hair in a swept back curly 'do

Posing up: Keira with Michael Fassbender, who plays Carl Jung in the film, and Viggo Mortensen, who stars as Sigmund Freud

'It was different to today, but you don’t want to get bogged down in that, so it becomes more about the costumes and everything else. You want to keep it accessible and fresh.'

A Dangerous Method was actually the third time Mortensen has worked with Cronenberg, however, and the Danish-American actor said recently he was very surprised that the movie missed out on any big award nominations.

He said: 'I would like to have seen our movie recognised. I would certainly like David Cronenberg to be recognised.

Peekaboo! Fassbender jokes around with Keira as she posed up for photographs at the event

Promotional duties: Keira hurries along to pose up with her co-stars for waiting photographers. At one point, Mortensen's hand looked very low on Keira's back as the pair posed up

'I don’t know if he’s ever been nominated for a directing BAFTA, I know he never has been for an Oscar or a Golden Globe which is startling to me still.

'But I don’t care about it in any sense other than, well, to some degree it would be a vindication of his work and our work on the movie, but it helps put people on seats, it helps people see the movie in theatres.'

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