Amy Adams rocks a baggy T-shirt and sweatpants as she transforms into Lynne Cheney alongside co-star Christian Bale on the set of political drama Backseat

They're playing former US Vice President Dick Cheney and his wife Lynne in the upcoming biopic.

And Amy Adams looked unrecognisable as she transformed into the politician's wife on the set of Backseat in Whittier, California on Monday.

Meanwhile, Christian Bale donned a smart suit as he portrayed a young Dick to film the couple's wedding scene in the political drama, directed by Adam McKay.

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On set: Amy Adams looked unrecognisable as she transformed into former US Vice President Dick Cheney's wife Lynne on the set of Backseat in Whittier, California on Monday

On set: Amy Adams looked unrecognisable as she transformed into former US Vice President Dick Cheney's wife Lynne on the set of Backseat in Whittier, California on Monday

Drama: Christian donned a smart suit as he portrayed a young Dick while filming a wedding scene earlier in the week 

Drama: Christian Bale donned a smart suit as he portrayed a young Dick to film the couple's wedding scene in the political drama, directed by Adam McKay

Amy cut a casual figure in a baggy white T-shirt and grey sweatpants, set off with khaki sandals.

She covered up her flame-coloured tresses with a short blonde wig and sported barely-there make-up.

While she is best known for being the spouse of the former Vice President, Lynne - nee Vincent - is herself an accomplished author, academic and executive.

Christian, who has put on weight for the role, was clad in a smart wedding tux as he got to work on set.

Political film: The film will chronicle Dick's rise to becoming arguably the most powerful Vice President in history, and will examine the effect his policies had on the world

Political film: The film will chronicle Dick's rise to becoming arguably the most powerful Vice President in history, and will examine the effect his policies had on the world

Transformation: Amy rocked a short blonde wig to portray Lynne (right) - an accomplished author, academic and executive

In character: Christian was clad in a smart wedding tux as he got to work on set as Dick (right)
In character: Christian was clad in a smart wedding tux as he got to work on set as Dick (right)

In character: Christian was clad in a smart wedding tux as he got to work on set as Dick (right) 

The film will chronicle Dick's rise to becoming arguably the most powerful Vice President in history, and will examine the effect his policies had on the world.

In later years, the politician became the CEO of Halliburton but was most notably known for being in the center of foreign policy which pursued both Afghanistan and Iraq wars.

It seems unlikely he shall be cast in a favorable light, as the film is written and directed by Democrat and Bernie Sanders supporter Adam McKay.

Plot: It seems unlikely he shall be cast in a favorable light, as the film is written and directed by Democrat and Bernie Sanders supporter Adam McKay 

Plot: It seems unlikely he shall be cast in a favorable light, as the film is written and directed by Democrat and Bernie Sanders supporter Adam McKay 

Getting wiggy with it: Amy covered up her red hair with her short wig
Getting wiggy with it: Amy covered up her red hair with her short wig

Getting wiggy with it: Amy covered up her red hair with her short wig

All star cast: Notable stars already signed on to the film include Steve Carrell as former Secretary of Defense Donald Rumsefeld and Bill Pullman as Gerald Ford's second in command, Nelson Rockefeller

All star cast: Notable stars already signed on to the film include Steve Carrell as former Secretary of Defense Donald Rumsefeld and Bill Pullman as Gerald Ford's second in command, Nelson Rockefeller

Low-key: Amy cut a casual figure in a baggy white T-shirt and grey sweatpants, set off with khaki sandals
Low-key: Amy cut a casual figure in a baggy white T-shirt and grey sweatpants, set off with khaki sandals

Low-key: Amy cut a casual figure in a baggy white T-shirt and grey sweatpants, set off with khaki sandals

Notable stars already signed on to the film include Steve Carrell as former Secretary of Defense Donald Rumsefeld and Bill Pullman as Gerald Ford's second in command, Nelson Rockefeller.

Sam Rockwell is set to portray the 43rd President, George W. Bush, and Lisa Gay Hamilton will play former Secretary of State Condoleeza Rice.

Tyler Perry meanwhile has been cast as her predecessor, Colin Powell.

Character actor: No stranger to undergoing an image overhaul, Bale previously demonstrated his commitment to transforming for roles when he tanned and beefed up for American Psycho in 2000 and shed 70lbs for The Machinist in 2004

Character actor: No stranger to undergoing an image overhaul, Bale previously demonstrated his commitment to transforming for roles when he tanned and beefed up for American Psycho in 2000 and shed 70lbs for The Machinist in 2004

Change: The star was sporting a fuller frame to take on the role. He is pictured (right) in April 2017 before filming
Change: The star was sporting a fuller frame to take on the role. He is pictured (right) in April 2017 before filming

Change: The star was sporting a fuller frame to take on the role. He is pictured (right) in April 2017 before filming 

No stranger to undergoing an image overhaul, Bale previously demonstrated his commitment to transforming for roles when he tanned and beefed up for American Psycho in 2000 and shed 70lbs for The Machinist in 2004.

In 2013, Bale told People that gaining weight for American Hustle was not difficult: 'It's easy to start with ... you're just sitting on your butt and you're eating lots of doughnuts and eating bread and everything like that.

'But you do it for two months and your body starts to rebel against you, it's just saying, "No, please," and your back is aching and there's also some problems with that.

'And then you've got to lose the weight at the end of it, you know? I wish it was simple.'

Amy and Christian last graced the silver screen together in the 2013 crime drama American Hustle alongside Jennifer Lawrence, Bradley Cooper and Jeremy Renner.

Bridesmaids: The cast got ready to film the wedding scene in unflattering 60s ensembles 

Bridesmaids: The cast got ready to film the wedding scene in unflattering 60s ensembles