Never listen to Ashton Kutcher.

That's the lesson we're taking away from the new issue of GQ, after reading that he once tried to encourage then-girlfriend January Jones to quit acting.

"[He] was NOT supportive of my acting," the Mad Men star tells the magazine. "He was like, 'I don't think you're going to be good at this.' So, f**k you!"

Damn straight!

Now that the Golden Globe-nominated actress stars as depressed housewife Betty Draper on the Emmy-winning AMC series, she isn't holding a grudge against Demi Moore's Twitter-obsessed husband, who "only has nice things to say" now.

"If anything, I should thank him," she says, putting the best spin on it. "The minute you tell me I can't do something, that's when I'm most motivated."

January never seemed so hot until now.

The onetime Abercrombie and Fitch model was at the gravesite of Doors frontman Jim Morrison in Paris when she realized she was "miserable" modeling.

"I left the agency and then - very quickly - decided to go to L.A. and try acting," January Jones recalls of how she got her start. "Without any training!"

She's still searching for the right guy, however.

"Dear men of America," she says into the GQ interviewer's recorder. "I like beer. I like football. I'm probably the most interesting girl you'll ever meet."

Need more convincing? Click to enlarge the pics below!