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Where have you gone, Zach Galifianakis?

Up until Sunday, "The Hangover" funnyman had not made a public appearance in a year. But when he showed up over the weekend to a screening of "Birdman (or The Unexpected Virtue of Ignorance)," a noticeably thinner funnyman appeared.

Asked about the weight loss, Zach joked to E! News, saying, "I'm dying" before claiming that his suit jacket was a "ladies [size] 50."

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Sporting a tailored suit (of whatever size), a scruffy beard and long locks, Zach looked noticeably slimmer than his former self, when he was much, much heavier.

The million dollar question: How did he lose the weight?

He apparently quit drinking.

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Last October, Zach appeared on Conan O' Brien and spoke hilariously about his ongoing weight loss.

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"I stopped drinking and I just kind of put the weight off … I was having a lot of vodka with sausage," he said, "delicious but bad for you."

He added, "I was getting into too much trouble with the drinking, so I just kind of stopped."

Keep up the good work, Zach.