Who knew they were friends? Keira Knightley heads out on the town with fiance James Righton... and DJ Mark Ronson

PUBLISHED: 15:44 EST, 4 November 2012 | UPDATED: 02:53 EST, 5 November 2012

She's one of the biggest names in Hollywood so no doubt has a large list of celebrity pals saved in her phone book.

And it seems Keira Knightley has extended her star social group even more.

The Pirates of the Caribbean star headed out in London on Saturday night with her fiance James Righton.

Star pals: Keira Knightley heads out on the town in London with her fiance James Righton, as well as music producer pal Mark Ronson

And it seems going out with a rocker has increased her musician pals as super producer Mark Ronson also headed out with the loved-up couple.

The two couples headed to popular hot spot the Groucho with several other friends.

Keira dressed for the occasion by wrapping up warm in a beige fur-lined coat, which she wore with skinny jeans and boots.

Ensuring she wouldn't get cold as she left the venue, Knightley also wore a scarf to keep her warm in the wintery London streets.

Smile! Keira, who is in London filming her latest movie, spent the evening mingling at hot spot the Groucho

She looked like she was in a jovial mood as she smiled sweetly at passersby and the waiting cameras as she linked arms with a male pal.

And her rocker beau, Klaxons' James Righton, wasn't far away as he stood in a crowd with Keira, Ronson and his wife, French actress Josephine de la Baume.

Mark dressed in his usual style, wearing skinny jeans, plimsolls and a White T-shirt with an electric blue suit jacket.

Josephine also went for smart casual in faded jeans and black boots with a high-neck top and jacket.

It was a welcome night off for Keira, who has been busy filming her CIA action film Jack Ryan, while movie Anna Karenina is about to hit screens.

Date night: It was a couples' evening as Keira spent the evening with fiance James and Ronson brought wife Josephine de la Baume along

She recently spoke out about her role in Anna Karenina, admitting she shares some of the traits of her character.

Keira told Flare magazine: 'There are aspects of her that I don't like. Then you go: "Am I any better?"

'I am duplicitous and manipulative and all those things/ Hopefully that doesn't define me but they are parts of my personality.'

Keira also said of the film: 'Tom Stoppard [who wrote the screenplay] said at the beginning that this is a thesis on love, and I said "Ummm. Er. Okay."

'And I think he’s quite right. Not just the sparkly bit that we’re sold, the fun, the hopefully great sex, but it’s also looking at the loneliness, the pain, the jealous madness that is all a part of that.'

Where next? Knightley was seen standing outside the venue with Ronson, who stood next to Klaxons rocker Righton

The Never Let Me Go star also said that she is incredibly stubborn about not letting photographers get any shots of her drunk or misbehaving.

She added: 'When I was very young, I was hounded by these hideous men.

'What they wanted was the picture of me falling out of the club.

'They weren’t going to get that out of me. No, I chose very, very deliberately not to, because I couldn’t bear the idea of giving in to them. It takes a stubbornness.'

She is currently in London filming Jack Ryan.

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She must be one of the most naturally beautiful 'stars' Engand has ever produced, and vey talented with it too. I bought a diet and fitness program a few months ago through how2reducefatfast.com that is designed to get a body like hers - If I can look just half as good as she does in the end I would be over te moon!

- Shelley Ferguson , wolves, United Kingdom, 05/11/2012 18:42

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"while movie Anna Karenina is about to hit screens" ... 2 months ago

- tommay , Bournemouth, United Kingdom, 05/11/2012 11:45

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It doesn't surprise me at all these two know eachother. Both full of themselves, both overrated and both extremely lucky.

- Box , Outlands, Netherlands, 05/11/2012 09:47

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keira knightley: always gorgeous! mark ronson: blerght/ewww

- mayagrw , oslo, Norway, 05/11/2012 07:26

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This is the best i've ever seen Kiera look. So happy and healthy looking!