It's safe to say Zach Galifianakis is NOT the father of January Jones' mystery baby -- because Zach says the "Mad Men" star was so rude to him the first time they met -- he CUSSED HER OUT.
Zach recounted the story during an interview with TheShortList.com -- after TSL told him January recently named him as one of the funniest men in town.
Zach, apparently shocked by the comment, replied, "That’s really funny because, if I remember correctly, she and I were very rude to each other."
He explained, "It was crazy. I was at a party — I’d never met her — and she was like, 'Come sit down.' So I sit at her table and talk for 10 minutes, and she goes, 'I think it’s time for you to leave now.'"
"So I say, 'January, you are an actress in a show and everybody’s going to forget about you in a few years, so f*cking be nice,' and I got up and left. And she thinks that’s funny.'"
TSL then asked if Zach would ever do a sex scene with January -- and he replied, "I wouldn't want to. I'd hate it."