Renée Zellweger looks unrecognizable in her new "fat suit" look.

On Monday, October 4, the Academy Awards winning actress, 52, was spotted on the set of the new NBC crime series, The Thing About Pam, in which she is cast to play real-life convicted killer, Pam Hupp.

She was pictured donning a large bodysuit-like undergarment with loose jeans and an oversized winter jacket. The bodysuit-like undergarment was later spotted being carried by a wardrobe assistant.

In the released snaps, Zellweger was also sipping on a soda while she appeared to have a prosthetic nose as she was seen heavily made-up to resemble the criminal.

The actress' new look comes after years of yo-yo dieting to portray her character in the Bridget Jones film series.

About Her ‘The Thing About Pam’ Character

In the forthcoming series The Thing About PamZellweger will be seen portraying Hupp, who — while already serving a life sentence for shooting a disabled man dead — recently pleaded not guilty to the murder of her friend Elizabeth Faria. Faria was stabbed 55 times in her Missouri home in 2011.

Prosecutors have alleged that Hupp killed Faria four days after persuading her to switch a $150,000 life insurance policy to her and was blamed for trying to frame Faria's husband, Russell.

The limited series will reportedly consist of six episodes and will be co-produced by Zellweger’s own production company, Big Picture Co. The release date, however, hasn't been published yet.

‘Fat Suit’ Controversy in the Industry

Over the years, Hollywood has seen many instances in the recent past, where actors have been heavily criticized for using "fat suit" and unnecessary transformation.

Actors like Gwyneth Paltrow and Sarah Paulson previously admitted they regret wearing them for their respective roles. Paltrow said that she regretted the choice to wear one in the movie Shallow Hall, calling it a "disaster," and felt "humiliated" when wearing it in public.

On the other hand, the American Horror Story star caught controversy for wearing a fat suit while portraying late White House employee Linda Tripp on the FX series Impeachment: American Crime Story.

She later issued an apology, saying,

It’s very hard for me to talk about this without feeling like I’m making excuses. There's a lot of controversy around actors and fat suits, and I think that controversy is a legitimate one. I think fat phobia is real. I think to pretend otherwise causes further harm.

Even now, many people on Twitter have been arguing that production should have simply chosen an actress with a body type closer to Hupp’s. "Renee Zellweger unrecognizable in a fat suit on set of Pam Hupp movie, Meanwhile, non-skinny actresses get overlooked for non-stereotypical roles," someone tweeted.

Renee Zellweger Known for Her Yo-Yo Diet

While Zellweger flaunted her new "oversized" look for her new role, she is also known for keeping her weight in check.

Her body weight transformation came back in 2001 to turn up for her role in Bridget Jones. She famously embarked on a 4,000 calorie-a-day diet to load on 20lbs in just a few months, and subsequently, as she gained the curves, her weight plummeted to a sinewy size zero.

But at times, she also admitted that following such a strict diet left her feeling "whacked" and even led to panic attacks.