Sienna Miller and Bradley Cooper are co-ordinating co-stars in preppy royal blue jumpers and shirts for Burnt photocall

They famously paired up for American Sniper last year - and Bradley Cooper and Sienna Miller proved that they are still in sync when they promoted their second film on Thursday.

The actor co-ordinated in preppy royal blue jumpers over pastel shirts for the film photocall of Burnt, on which they have collaborated once again. 

Sienna, 33, naturally added her style finesse to the outfit and paired her image with brown leather trousers and her favourite suede shoes as she reunited with her co-star at the LA event.

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Looking chic: Sienna Miller accompanied co-star Bradley Cooper to the film photocall of Burnt in Los Angeles on Thursday

Looking chic: Sienna Miller accompanied co-star Bradley Cooper to the film photocall of Burnt in Los Angeles on Thursday

Be hell bent for leather this fall in Sienna's Kenneth Cole trousers

Just when you finally saved up for some leather biker skinny jeans, there's a new boss in town.

We're not saying do away with those figure hugging pair, but we are saying that the fashion industry is trending toward loose- fitting trouser cut leather pants.

And if you need anymore proof as to why you too should jump down the throat of this style-- just look at how casual, relaxed and chic Sienna looked during her photocall this morning.

Before you fall head over heels in love with these buttery soft leather beauties like we did, we must tell you now that they are completely sold out. She's brought these back from last season!

But that just goes to show you that a classic pair of trousers, (in leather no less) will take you through the years.

So browse out edit below to shop similar styles. We've procured some in that gorgeous cognac hue, and some in black in case that's what you fancy. Have a look!

* PRICES MAY NOT BE AS ADVERTISED

Sienna, who recently returned to her more familiar blonde tresses from a rouge style, swept her hair over into an effortlessly chic up-do.

Her only accessories - notably minus her engagement ring from recently estranged Tom Sturridge - included a chunky chuff bracelet and some hoop on her exposed left ear.

Prepped for her close up, the blonde was minimally made up with just mascara and a naturally pink lipstick as she answered questions about the upcoming comedy.

Matching: The pair wore matching royal blue jumpers with shirts to present their second project together

Matching: The pair wore matching royal blue jumpers with shirts to present their second project together

Minimalist: Sienna looked exquisite in minimal make-up as she answered questions on the film

Minimalist: Sienna looked exquisite in minimal make-up as she answered questions on the film

The new film features a distinctly different tone to 2014's American Sniper; all about heroic Navy S.E.A.L. sniper Chris Kyle (played by Cooper) and the wife he left behind Taya (played by Miller).

This time around, the acting pair take on a comedy, which they began to film in 2014, amidst the hype of their true life portrayal.

Sienna plays the Helene to Bradley's Adam Jones; a top chef who ditches his drugs and an associated bad reputation to return to London in the hopes of heading up a Michelin-star restaurant.

Chic: She pair her jumper with leather trousers and a large statement cuff bracelet

Chic: She pair her jumper with leather trousers and a large statement cuff bracelet

Second project: The pair have been able to work on a second project together after American Sniper

Second project: The pair have been able to work on a second project together after American Sniper

It's another big part for Sienna, who's thought to have recently split with the father of her only child Marlowe.

Her latest project spurred her on to discuss the hot topic of sexism in the acting industry during a chat beside Bradley on Wednesday.

Sienna revealed that she had recently been forced to turn down a role because of the vast gap in pay between herself and a male colleague.

She told E! News: 'I walked away from a play I wanted to do because I was offered less than half of what the other man was offered and it was just the two of us.'

Acting talent: The blonde talked about the comedy, which follows a very different tone to their previous project

Acting talent: The blonde talked about the comedy, which follows a very different tone to their previous project

It was recently revealed that Bradley's American Hustle co-star Jennifer Lawrence, along with Amy Adams, were paid much less than their male counterparts, with Jennifer insisting that she had failed as a negotiator. 

Bradley supported Sienna by adding: 'One thing I could say is that's interesting because if you think that you only deserve a certain amount and that's not correct. 

'It's about changing that mindset and sticking up for yourself the way that Sienna did.' 

Sexism: Sienna recently revealed that she'd been forced to turn down a theatre role because of the significant gap in pay between herself and a male counterpart

Sexism: Sienna recently revealed that she'd been forced to turn down a theatre role because of the significant gap in pay between herself and a male counterpart

In her corner: Bradley said her supported Sienna's words on the pay gap, admitting that it's about changing assumptions 

In her corner: Bradley said her supported Sienna's words on the pay gap, admitting that it's about changing assumptions 

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