Zach Galifianakis reveals dramatic weight loss

Zach Galifianakis has debuted significant weight loss at his first public appearance in a year.

The Hangover actor looked incredibly svelte as he attended the premiere of Birdman at the closing of the New York Film Festival on Sunday.

Zach Galifianakis has debuted significant weight loss

The 45-year-old funnyman looked dapper in a grey suit featuring fine blue checks, matching pale blue shirt and navy tie.

He also sported his signature beard and jaw-length curly hair.

Zach likes to maintain a low profile. Speaking of being in the spotlight, he said "I like to be an actor, and that's it... I'd rather just do my work and go home and watch Lifetime."

The 45-year-old funnyman looks significantly slimmer than his former rotund self

This isn't the first time that the America star has shed weight. He lost several pounds when he cut out alcohol in early 2013.

According to IMDb, his latest film, Birdman Or The Unexpected Virtue of Ignorance, focuses on a washed-up actor called Riggan Thomson, played by Michael Keaton, "who once played an iconic superhero".

He "must overcome his ego and family trouble as he mounts a Broadway play in a bid to reclaim his past glory."

Naomi Watts plays the protagonist's girlfriend, Lesley, a nervous actress in the play while Zach plays Jake, the play's producer, in the black comedy.