Actor Zach Galifianakis' weight loss shock

Zach Galifianakis shows off his slimmed down frame at the Screen Actors Guild Awards in Los Angeles. Photo/AP

In October, he debuted his thinner frame at the Birdman premiere in New York.

And it appeared Zach Galifianakis continued to keep the extra kilos off when he helped open the Screen Actors Guild Awards ceremony during the introductory montage.

On Sunday, the 45-year-old actor skipped the red carpet and surprised many with his slimmed down transformation and lightly bearded face.

Along with his unrecognisable physique Galifianakis sported a man bun, possibly a nod to presenter Jared Leto's trendy hairstyle.

While promoting his award-winning film Birdman, Galifianakis hilariously joked about his weight loss with WGN.

Zach Galifianakis photographed in 2008 and 2015. Photo / Getty Images

"[I lost] about 30 ounces,' he said. 'I started walking a bunch and gave up booze. Booze, I was done with it. I couldn't wake up [like usual], so I stopped. I'm lucky that I could just stop, but boy I miss it."

He added: "Being light is fun. I can go up two flights of steps now, and only need my inhaler twice."

Although he did not share just how many pounds he shed, Men & Fitness believes Zach lost between 22 to 27 kilos.

"I was having a lot of vodka with sausage, delicious but bad for you," he revealed during an appearance on Conan O'Brien's late night show in May 2013.

- Daily Mail