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One Of Liam Hemsworth's 'Hunger Games' Co-Stars Didn't Even Realize Chris Was His Brother

And here we thought everyone knew that.

During a junket interview from last year's "Hunger Games: Catching Fire" press circuit, Woody Harrelson made a world-changing revelation: His "Mockingjay" co-star Liam Hemsworth... and "Thor" actor Chris Hemsworth... are brothers.

"Jesus, I never got that he was your brother," Woody says to a baffled Hemsworth. "Until just now. And you do have the same last name, now that I think about it."

Harrelson might play alcoholic lush Haymitch Abernathy in the "Hunger Games" franchise, but apparently he's just as absent-minded while sober in IRL interviews. The actor maintains throughout the entire giggle-fit interview, "I honestly never put that together." Yeah, OK, Woody.

Watch the hilarious clip below.

Catch Harrelson and Hemsworth this weekend as "The Hunger Games: Mockingjay - Part 1" hit theaters.